Ray Optics & Optical Instruments  MCQs

MCQs of Ray Optics & Optical Instruments

Showing 1 to 10 out of 143 Questions
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1.
An object is placed at a distance of 25 cm on the axis of a concave mirror, having focal length 20 cm. Find the lateral magnification of an image.
(a) 2
(b) 4
(c) -4
(d) -2
Answer:

Option (c)

2.
A fish in a lake is at a 6.3 m distance from the edge of the lake. If it is just able to see a tree on the edge of the lake, its depth in the lake is _____ m. Refractive index of the water is 1.33.
(a) 6.30
(b) 5.52
(c) 7.5
(d) 1.55
Answer:

Option (b)

3.
For a thin convex lens when the heights of the object is double than its image, its object distance is equal to _____ focal length of a lens is f.
(a) f
(b) 2f
(c) 3f
(d) 4f
Answer:

Option (c)

4.
Depth of a well is 5.5 m and refractive index of water is 1.33 . If viewed from the bottom, by how much height would the bottom of the well appear to be shifted up ?
(a) 5.5 m
(b) 2.75 m
(c) 4.13 m
(d) 1.37 m
Answer:

Option (d)

5.
The focal length of a thin lens made from the material of refractive index 1.5 is 20 cm. When it is placed in a liquid of refractive index 1.33, its focal length will be ______ cm.
(a) 80.81
(b) 45.48
(c) 60.25
(d) 78.23
Answer:

Option (d)

6.
A tank contains water upto a height of 30 cm and above it an oil uo to another 30 cm height. _____ cm shifts in the position of bottom of the tank is observed when viewed from the above. Refractive indices of water and oil are 1.33 and 1.28, respectively.
(a) 7.44
(b) 6.46
(c) 14.02
(d) 6.95
Answer:

Option (c)

7.
For a thin convex glass lens with radius of curvature 20 cm, focal length is _____ cm. Refractive index (n) of the material of the lens is 1.5 and it is kept in air
(a) 20
(b) 40
(c) 60
(d) 80
Answer:

Option (b)

8.
A ray of light is incident normally on the surface of an equileteral prism made up of material with refractive index 1.5. The angle of deviation is _____ .
(a) 30°
(b) 45°
(c) 60°
(d) 75°
Answer:

Option (c)

9.
Which of the following is responsible for glittering of a diamond ?
(a) Interference
(b) Diffraction
(c) Total internal reflection
(d) Refraction
Answer:

Option (c)

10.
The radii of curvature of both the sides of a convex lens are 15 cm and if the refractive index of the material of the lens is 1.5, then focal length of lens in air is _____ cm
(a) 10
(b) 15
(c) 20
(d) 30
Answer:

Option (b)

Showing 1 to 10 out of 143 Questions
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