PhysicsAdvancedHigh School (11–12)Optics › Reflection of LightNEETAEEE (Amrita)AMUEEEAP EAPCETBCECECMI Entrance
Created by StemPy LabAssertion (A): A polished concave mirror has a focal length of in air. When the same mirror is placed in a tank of clear water, facing a narrow beam of light that travels through the water, its focal length is still . Reason (R): The mirror formula has only distances in it, and light travels at the same speed in water as in air, so nothing in the formula changes when the mirror is put into water.
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← A concave mirror has a focal length of 20 cm. A small object is placed on its axis at the four distances in List-I. Match each with the image it forms, described in List-II. List-I (Object distance from the mirror) A. 10 cm B. 30 cm C. 40 cm D. 60 cm List-II (Image formed) I. Real, inverted, half as large, 30 cm in front II. Real, inverted, twice as large, 60 cm in front III. Real, inverted, same size, 40 cm in front IV. Virtual, erect, twice as large, 20 cm behindA ray of light travels between glass of refractive index 1.50 and water of refractive index 1.33. Two statements about total internal reflection at their plane boundary are given below. Statement I: A ray in the glass that meets the boundary at an angle of incidence of 50° is totally reflected. Statement II: A ray in the water that meets the glass at any angle of incidence is never totally reflected. →
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