Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Class 12 Physics 35 Years JEE Mains &Advance Past year Paper

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The document Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev is a part of the JEE Course Class 12 Physics 35 Years JEE Mains &Advance Past year Paper.
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Q.1. The focal length of a thin biconvex lens is 20 cm. When an object is moved from a distance of 25 cm in front of it to 50 cm, the magnification of its image changes from m25 to m50. The ratio Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev        (2010)

Ans. 6

Solution. Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Q.2. A large glass slab (μ= 5 / 3) of thickness 8 cm is placed over a point source of light on a plane surface. It is seen that light emerges out of the top surface of the slab from a circular area of radius R cm. What is the value of R?     (2010)

Ans. 6

Solution. In the figure, C represents the critical angle

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Q.3. Image of an object approaching a convex mirror of radius of curvature 20 m along its optical axis is observed to move from 25/3 m to 50/7 m in 30 seconds. What is the speed of the object in km per hour?  (2010)

Ans. 3

Solution. Using mirror formula for first position

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Using mirror formula for the second position

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Change in position of object = 25 m

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Q.4. Water (with refractive index = 4/3) in a tank is 18 cm deep. Oil of refractive index 7/4 lies on water making a convex surface of radius of curvature ‘R = 6 cm’ as shown. Consider oil to act as a thin lens. An object ‘S’ is placed 24 cm above water surface. The location of its image is at ‘x’ cm above the bottom of the tank. Then ‘x’ is     (2011)

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Ans. 2

Solution. For the convex spherical refracting surface of oil we apply

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

∴ v = 21 cm 

For water-oil interface

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

∴ V' = 16 cm.

This is the image distance from water-oil interface.

Therefore the distance  of the image from the bottom of the tank is 2 cm.

Q.5. A Young's double slit interference arrangement with slits S1 and S2 is immersed in water (refractive index = 4/3) as shown in the figure. The positions of maximum on the surface of water are given by x2 = p2m2λ2 – d2, where l is the wavelength of light in air (refractive index = 1), 2d is the separation between the slits and m is an integer. The value of p is      (JEE Adv. 2015)

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Ans. 3

Solution. For maxima 

Path defference = mλ

∴ S2A – S1A = mλ

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Q.6. Consider a concave mirror and a convex lens (refractive index = 1.5) of focal length 10 cm each, separated by a distance of 50 cm in air (refractive index = 1) as shown in the figure. An object is placed at a distance of 15 cm from the mirror. Its erect image formed by this combination has magnification M1. When the set-up is kept in a medium of refractive index 7/6, the magnification becomes M2. The magnitude Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev is         (JEE Adv. 2015)

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Ans. 7

Solution. Applying mirror formula

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

For convex lens u = |2f

Therefore image will have a magnification of 1.

When the set – up is kept in a medium 

The focal length of the lens will change

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev = 17.5 cm.

Applying lens formula Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev= Magnification by lens Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Q.7. The monochromatic beam of light is incident at 60° on one face of an equilateral prism of refractive index n and emerges from the opposite face making an angle θ(n) with the normal (see the figure). For n = √3 the value of q is 60° and Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

The value of m is                     (JEE Adv. 2015)

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Ans. 2

Solution. Here ∠MPQ + ∠MQP  = 60°. If ∠MPQ = r then ∠MQP 

= 60 – r 

Applying Snell’s law at P 

sin60° = n sin r                    ...(i) 

Differentiating w.r.t ‘n’ we get

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev  ...(ii)

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

Applying Snell’s law at Q 

sin θ = n sin (60° – r) ...(iii)

Differentiating the above equation w.r.t ‘n’ we get

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev

[from (ii)]

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev [sin (60° – r) + cos (60° – r) tan r] ...(iv)

From eq. (i), substituting n = √3 we get r = 30° 

From eq (iii), substituting n = √3 , r = 30° we get θ = 60°

On substituting the values of r and θ in eq (iv) we get

Integer Value of Ray and Wave Optics, Past year Questions JEE Advance, Class 12, Physics JEE Notes | EduRev [sin 30° + cos 30° tan 30°] = 2

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