Light Reflectio...

An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the original and final images seen in the mirror is:An object is placed 20 cm in front of a plane mirror. The mirror is moved 2 cm towards the object. The distance between the positions of the original and final images seen in the mirror is:

A ray of light strikes a plane mirror PQ at an angle of incidence of 30^o, is reflected from the plane mirror and then strikes a second plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is:

An object is 100 mm infront of a concave mirror which produces an upright image (erect image). The radius of curvature of the mirror is:

Which position of the object will produce a magnified virtual image, if a concave mirror of focal length 15 cm is being used?

A concave mirror produces a magnification of +4. The object is placed:

Two big mirrors A and B are fitted side by side on a wall. A man is standing at such a distance from the wall that he can see the erect image of his face in both the mirrors. When the man starts walking towards the mirrors, he finds that the size of his face in mirror A goes on increasing but that in mirror B remains the same:

A ray of light travelling in waterfalls at right angles to the boundary of a parallel-sided glass block. The ray of light:

A ray light passes from a medium X to another medium Y. No refraction of light occurs if the ray of light hits the boundary of medium Y at an angle of:

A lens of focal length 12 cm forms an erect image, three times the size of the object. The distance between the object and image is:

If an object is placed 21 cm from a converging lens, the image formed is slightly smaller than the object. If the object is p[laced 19 cm from the lens, the image formed is slightly larger than the object. The approximate focal length of the lens is: