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A cubical block of glass of refractive index n1 is in contact with the surface of water of refractive index 
. A beam of light is incident on vertical face of the block (see figure). After refraction, a total internal reflection at the base and refraction at the opposite vertical face, the ray emerges out at an angle 
. The value of q is given by :
The correct answer is:
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An insect starts moving up in a liquid from point O of variable refractive index 
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A ray of light is incident on a parallel slab of thickness t and refractive index n. If the angle of incidence qis small than the displacement in the incident and emergent ray will be :
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In the figure shown 
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A concave mirror is used to form image of the Sun on a white screen. If the lower half of the mirror were covered with an opaque card, the effect on the image on the screen would be
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In the figure shown, the image of a real object is formed at point I. AB is the principal axis of the mirror. The mirror must be :
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An object O is placed in front of a small plane mirror M1 and a large convex mirror M2 of focal length f. The distance between O and M1 is x, and the distance between M1 and M2 is y. The images of O formed by M1 and M2 coincide. The magnitude of f is
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