The sun subtends an angle of half a degree at the pole of a concave mirror which has a radius of curvature of 15 metres. Then the size (disameter) of the image
of the sun formed by the concave mirror is
A ray of light strikes a plane mirror PQ at an angle of incidence of 30∘, is reflected from the plane mirror QR placed at right angles to the first mirror. The angle of reflection at the second mirror is: Draw a ray diagram to illustrate your answer.
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A ray of ligth makes an angles of with the horizontal and strikes a plane mirror which is inclined at an angle to the horizontal.The angl for which
the reflected ray becomes vertical, is
If the critical angle for total internal reflection from a medium to vacuum is 30°
the velocity of light in the medium is
The minimum deviation for a ray of light through a prism is 44° and when this happens the angle of incidence is 50° The refracting angle of the prism is
Two immiscible transparent liquids of refractive indices 1.5 and 4/3 are arranged as shown in figure. The apparent depth of mark at the bottom from top surface is
When the object is at a distance x1 and x2, a real and a virtual image of the same size are formed respectively. The focal length of the convex lens is
A person can see objects only at distance greater than 40 cm. He is advised to use lens of power