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Physics -- Optics
11.
Half the surface of a transparent sphere of refractive index 2 is
silvered. A narrow, parallel beam of light is incident on the
unsilvered surface, symmetrically with respect to the silvered
part. The light finally emerging from the sphere will be a
- A.parallel beam
- B.converging beam
- C.slightly divergent beam
- D.widely divergent beam
- Answer
- Report
Answer : [A]
12.
A boy of height 1 m stands in front of a convex mirror. His
distance from the mirror is equal to its focal length. The height of
his image is
- A.0.25 m
- B.0.33 m
- C.0.5 m
- D.0.67 m
- Answer
- Report
Answer : [C]
13.
A ray of light is incident normally on one of the faces of a prism
of apex angle 30o and refractive index √2. The angle of deviation
of the ray is
- A.00
- B.12.5o
- C.15o
- D.22.5o
- Answer
- Report
Answer : [C]
14.
A ray of light is incident normally on one face of an equilateral prism of refractive index 1.5. The angle of deviation is
- A.30o
- B.45o
- C.60o
- D.75o
- Answer
- Report
Answer : [C]
15.
A thin prism P1 of angle 4o, and made from a glass of refractive index 1.54, is combined with another thin prism P2 made from a glass of refractive index 1.72, to produce dispersion without
deviation. The angle of P2 is
- A.5.33o
- B.4o
- C.3o
- D.2.6o
- Answer
- Report
Answer : [C]
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