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qUESTIONS

A crane flying 6 m above a still, clear water lake sees a fish underwater. For the crane, the fish appears to be 6 cm below the water surface. How much deep should the crane immerse its beak to pick that fish? For the fish, how much above the water surface does the crane appear? Refractive index of water = 4/3.

A car uses a convex mirror of curvature 1.2 m as its rear-view mirror. A minibus of cross section 2.2 m x 2.2 m is 6.6 m away from the mirror. Estimate the image size.

A rectangular sheet of length 30 cm and breadth 3 cm is kept on the principal axis of a concave mirror of focal length 30 cm. Draw the image formed by the mirror on the same diagram, as far as possible on scale.

Estimate the number of images produced if a tiny object is kept in between two plane mirrors inclined at 35º, 36°, 40° and 45°.

A thin pencil of length 20 cm is kept along the principal axis of a concave mirror of curvature 30 cm. Nearest end of the pencil is 20 cm from the pole of the mirror. What will be the size of image of the pencil?

A small object is kept symmetrically between two plane mirrors inclined at 38°. This angle is now gradually increased to 41°, the object being symmetrical all the time. Determine the number of images visible during the process.

EThickness of the glass of a spectacle is 2 mm and refractive index of its glass is 1.5. Calculate time taken by light to cross this thickness. Express your answer with most convenient prefix attached to the unit second’.

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