If f_v and f_n are the focal lengths of a convex lens for violet ad red light respectively and F_V and F_R are the focal lengths of concave lens for violet and red light respectively, then we have

A convex lens of focal length 80 cm and a concave lens of focal length 50 cm are combined together. What will be their resulting power?

Diameter of human eye lens is 2mm. What will be the minimum distance between two points to resolve them, which are situated at a distance of 50m from eye? [The wavelength of light is 5000 Å]

One face of a rectangular glass plate 6 cm thick is silvered. An object held 8 cm in front of the first face, forms an image 12 cm behind the silvered face. The refractive index of the glass is 

Interference is possible in

The refractive index of the material of the prism is √3, then the angle of minimum deviation of the prism is

An astronomical telescope of ten fold angular magnification has a length of 44 cm. The focal length of the objective is

Which of the following phenomenon is not explained by Huygen's construction of wavefront?

A ray is incident at an angle of incidence i on one surface of a prism of small angle A and emerge normally from opposite surface. If the refractive index of the material of prism is μ, the angle of incidence is nearly equal to

Angle of deviation () by a prism (refractive index  = μ, and supposing the angle of prism A to be small) can be given by