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# Ray Optics Test 04 Class 12 Notes | EduRev

## Class 12 : Ray Optics Test 04 Class 12 Notes | EduRev

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CBSE TEST PAPER-04
CLASS - XII PHYSICS (Ray Optics)
1. The refractive index of a material of  a convex lens is n 1 it is immersed in a medium
of refractive index n 2. A parallel beam of light is incident on the lens. Trace the
path of the emergent rays when n 2 > n 1.

2. In a telescope the focal length of the objective and the eye piece are 60cm and 5cm
respectively. What is? (1) Its magnification power (2) Tube length

3. Although the surfaces of a goggle lens are curved it does not have any power.
Why?

4. A ray of light in incident normally on one face of the prism of apex angle 30
o
and
refractive index 2 . Find the angle of deviation for the ray of light?

5. A reflecting type telescope has a concave reflector of radius of curvature 120cm.
calculate the focal length of eye piece to secure a magnification of 20?

6. Show that a convex lens produces an N time magnified image, when the object
distances from eh lens have magnitude
f
f
N
? ?
±
? ?
? ?
. Here f is the magnitude of the focal
length of the lens.  Hence find two values of object distance. For which a convex lens of
power 2.5 D will produce an image that is four times as large as the object?

7. Define total infernal reflection of light? Hence write two advantages of total reflecting
prisms over a plane mirror?

8. (a) A person looking at a mesh of crossed wires is able to see the vertical lines more
distinctly than the horizontal wires. What is the effect due to? How is such a defect
of vision corrected?

(b) A man with normal near point (25cm) reads a book with small print using a
magnifying    glass: a thin convex lens of focal length 5cm.
(i)    What is the closest and the farthest distance at which he can read the book
when viewing through the magnifying glass ?
(ii)   What is the maximum and minimum angular magnificent (magnifying power)
possible using the above simple microscope?

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