A plane mirror is placed at origin parallel to y-axis, facing the positive x-axis. An object starts from (2m, 0, 0) with a velocity of . The relative velocity of the image with respect to the object is along
Relative velocity of image with respect to object is in negative-direction as shown in figure.
Consider an equiconvex lens of radius of curvature R and focal length f. Iff > R, the refractive index μ of the material of the lens
A fish is vertically below a flying bird moving vertically down toward water surface. The bird will appear to the fish to be
What is the angle of incidence for an equilateral prism of refractive index so that the ray is parallel to the base inside the prism?
A cube of side 2m is placed in front of a convex mirror of focal length 1 m with its face A at a distance of 3 m and face B at a distance of 5m form the mirror. The distance between the images of faces A and B and heights of images of A and B are, respectively,
A plano-convex lens when silvered on the plane side behaves like a concave mirror of focal length 60 cm. However, when silvered on the convex side, it behaves like a concave mirror of focal length 20cm. Then, the refractive index of the lens is
Two thin lenses are placed 5 cm apart along the same axis and illuminated with a beam of light parallel to that axis. The first lens in the path of the beam is a converging lens of focal length 10 cm whereas the second is a diverging lens of focal length 5 cm. If the second lens is now moved toward the first, the emergent light
A lens forms a real image of an object. The distance from the object to the lens is x cm and that from the lens to the image is y cm. The graph (see fig) shows the variation of y with x.
It can be deduced that the lens is
A point source S is placed at the bottom of different layers as shown in fig. The refractive index of the bottom-most layer is μ0. The refractive index of any other upper layer is
A ray of light starts from the source S as shown. Total internal reflection takes place at the upper surface of layer having n equal to
A concave mirror has a focal length of 20 cm. The distance between the two positions of the object for which the image size is double of the object size is