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Test on Ray Optics & Optical Instruments-1

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Question 1

An observer looks at a distance tree of height 10m with a telescope of magnifying power of 20. To the observer the tree appears:

Question 2

A person 1.6 m tall is standing at the center between two walls three meters high. What is the minimum size of a plane mirror fixed on the wall in front of him, if he is to see the full image of the wall behind him?

Question 3

A cubical block of glass is placed on a printed page lying on a horizontal surface. The minimum value of the refractive index of glass for which the letters on the page are not visible from any of the vertical faces of the block is

Question 4

In a room, there are plane mirrors covering its two adjacent walls and the ceiling. A person is standing at the centre of the room. The number of images formed by these 3 mirrors will be

Question 5

A rod 1.5 m long is placed along the principal axis of a convex mirror of focal length 60cm. The near end of the rod is 1m from the pole of the convex mirror. The length of the image of the rod is

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Dec 7JEE & BITSAT