Ray Optics and ...

The maximum focal length of the eye - lens of a preson is greater than is distance from the retina . The eye is

In case of linearly polarised light , the magnitude of electric field vector

A plano-convex lens of refractive index 1.5 and radius of curvature 30 cm is silvered at the curved surface . Now this lens has been used to from the image of an object . At what distance from this lens , an object be placed in order to have a real image of the size of the object ?

The penetration of light into the region of geometrical shadow is called

An object is placed at a distance of 40 cm in front of a concave mirror of focal length 20 cm . The image produced :

A concave lens of glass , refractive index 1.5 has both surfaces of same radius of curvature R . On immersion in a medium of refractive index 1.75, it will behave as a

When a beam of light is used to determine the position of an object , the maximum accuracy is achieved if the light is

Rainbow is formed due to a combination of

The minimum magnifying power of a telescope is M . If focal length of its eye lens is halved , the magnifying power will become

A convex lens and a concave lens , each having same focal length of 25 cm are put in contact to from a combination of lenses . The power of the combination is