Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - NEET MCQ

# Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - NEET MCQ

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## 10 Questions MCQ Test Daily Test for NEET Preparation - Test: Reflection of Light by Spherical Mirrors & Refraction (February 17)

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Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - Question 1

### A convex and a concave mirror of radii 10 cm each are facing each other and 15 cm apart. A point object is placed midway between them. Then position of the final image if the reflection first takes place at the concave mirror and then in the convex mirror is

Detailed Solution for Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - Question 1

for concave mirror u=−7.5 ; f=−5
(1/v)+1/u=1/f
1/v-2/15=-1/5
i.e, image formed at pole of convex mirror for convex mirror, u=0;f=+5
(1/v)+1/u=1/f
(1/v)+1/0=1/5
V=0
So the final image is formed on a pole of a convex mirror.

Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - Question 2

### What is the unit of power of lens?

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Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - Question 3

### If two thin lenses of power p1 and p2 are held in contact then the power of the combination will be​

Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - Question 4

An image is upright and reduced in size. Which mirror is used to form such an image?

Detailed Solution for Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - Question 4

Only Convex Mirror can form an image which is upright and reduced in size.

Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - Question 5

In mirrors how can we differentiate real image from the virtual image

Detailed Solution for Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - Question 5

A real image is defined as one that is formed when rays of light are directed in a fixed point.  A real image can be projected or seen on a screen. The best example of a real image is the one formed on a cinema screen.
A virtual image is defined as the opposite of a real image, therefore an image that cannot be obtained on a screen is referred to as a virtual image. The explanation for this is the fact that the rays of light that form a virtual image never converge therefore a virtual image can never be projected onto a screen. The best example of a virtual image is your reflection in the mirror.
Real images are produced by intersecting rays while virtual images are produced by diverging rays.
Real images can be projected on a screen while virtual ones cannot.
Real images are formed by two opposite lenses, concave and convex.
Virtual images are always upright while real images are always inverted.

Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - Question 6

The focal length of a convex lens (refractive index = 1.5) in air is 20 cm. When immersed in water (refractive index = 1.33), its focal length will be​

Detailed Solution for Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - Question 6

Focal length in air = 20 cm
Refractive index of air-water n₁= 1.33
Refractive index of air - glass n₂= 1.5
For focal length in air,
Using formula of lens
1/fair={(n2/n1)-1}(1/R1)-(1/R2)
Put the value into the formula
1/20={(1.5/1)-1}{(1/R1)-(1/R2)}
1/20=0.5{(1/R1)-(1/R2)}…1
We need to calculate the focal length in water
Using formula of lens
1/fwater={(1.5/1.33)-1}{(1/R1)-(1/R2)}
1/fwater=0.128{(1/R1)-(1/R2)}….2
fwater/20=0.5/0.128
fwater=78.125cm

Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - Question 7

We wish to make a plano convex lens of focal length 16 cm from glass having refractive index 1.5. It is to be used in air. What should be the radius of curvature of the curved surface?​

Detailed Solution for Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - Question 7

Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - Question 8

A convex lens produces a real image m times the size of the object. What is the distance of the object from the lens?

Detailed Solution for Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - Question 8

M=−ϑ /u ​=−m/1​
ϑ=−mu
(1/ϑ​)−(1/u)​=1/f
1/mu​+1/u​=−1/f​
(1+m)​/xu=−1/f​
u= (1+m)​f/(m)

Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - Question 9

A concave lens of glass, refractive index 1.5, has both surfaces of same radius of curvature R. On immersion in a medium of refractive index 1.75, it will behave as a:​

Detailed Solution for Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - Question 9

Consider refraction of light from infinity at first surface,
(μ2/v)​​−( μ1/u​)​=(μ2​−μ1/R)​​
(1.5​/ v1​)-(1.75/−∞)​=1.5−1.75​/−R
Consider refraction of this image from second surface,
​(1.75​/ v2)−(​1.5/v1)​=(1.75−1.5​)/R
Hence, v2​=3.5R
This is the image of light coming from infinity, therefore the focal length.
It is converging since focal length is positive.

Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - Question 10

Newtonian reflecting type telescope uses

Detailed Solution for Test: Reflection of Light by Spherical Mirrors & Refraction (February 17) - Question 10

A reflecting telescope (also called a reflector) is a telescope that uses a single or a combination of curved mirrors that reflect light and form an image. The reflecting telescope was invented in the 17th century, by Isaac Newton, as an alternative to the refracting telescope which, at that time, was a design that suffered from severe chromatic aberration. Although reflecting telescopes produce other types of optical aberrations, it is a design that allows for very large diameter objectives.
Astronomical (reflecting) telescopes. In a reflecting telescope, instead of a convex objective lens, a concave mirror is used to collect parallel rays from the object and form an image at the focal point. Then the convex eyepiece lens is used to magnify this image for the viewer.

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