Ray Optics Test...

The focal lengths of objective and the eye–piece of a compound microscope are f_o and f_e respectively.Then___________.

The magnifying power of a telescope is 9.0 when it is focused for parallel rays, then the distance between its objective and eye–piece is 20 cm The focal lengths of lenses will be___________.

A plano convex lens of f = 20 cm is silvered at plane surface new f will be___________cm

A ray of light from denser medium strikes a rarer medium at angle of incidence i. The reflected and refracted rays make an angle of 90^o with each other The angle of reflection and refraction are r and r \' respectively. The critical angle is ________________.

Relation between critical angle of water C_w and that of the glass C_g is _________. (given n_w = 4/3, n_g = 1.5)

The radius of curvature of convex surface of a thin plano–convex lens is 15 cm and refractive index of its material is 1.6 The power of the lens will be___________.

A ray of light passes through a prism having refractive index (n = √2), Suffers minimum deviation If angle of incident is double the angle of refraction within prism then angle of prism is____________.

An air bubble inside glass slab (n =1.5) appear from one side at 6 cm and from other side at 4 cm. Then the thickness of glass slab is____________cm

The magnifying power of objective of a compound microscope is 5.0 If the magnifying power of microscope is 30, then magnifying power of eye–piece will be_________.

Light of certain colour contain 2000 waves in the length of 1 mm in air. What will be the wavelength of this light in medium of refractive index 1.25 ?