Magnifying power of a compound microscope is the ratio of the angle formed by the final image to the angle formed by the object when
Total internal reflection of light is possible when light enters from
Total internal reflection of light is possible when light enters from Read More »
If in a plano-convex lens the radius of curvature of the convex surface is 10 cm and the focal length of the lens is 30 cm then the refractive index of the material of lens will be
The number of images observable between two parallel mirrors is
The number of images observable between two parallel mirrors is Read More »
A ray of light is incident on a plane mirror at an angle of incidence 300. The ray after reflection is deviated through
Spherical air bubble in water will act as
Spherical air bubble in water will act as Read More »
In a photometer two sources of light when placed at 30 and 50 cm respectively produce shadow of equal intervals. Their candles are in the ratio of
Two thin lenses, one of focal length +60 cm and the other of focal length -20 cm are kept in contact. Their combined focal length is
