A bird is flying 3 m above the surface of water. If the bird is diving vertically down with speed =

A point object O and a mirror M move with velocities of 3 cm s−1 and 4 cm s−1 respectively as shown

Nature of image of a real object formed by concave lens is

The refractive index of prism for a monochromatic light is √3 and its refracting angle is 60°. For m

Critical angle of incidence for a pair of optical media is 45°. The refractive indices of first and

An object is placed at a distance of 10 cm from a convex lens of power 5D. Find the position of the