List of top Physics Questions on Ray optics and optical instruments asked in Bihar Board XII

What type of wave is used in fibre optic communication?
For a thin lens find the formula \(\frac{1}{f} = (\mu - 1) \left(\frac{1}{R_1} - \frac{1}{R_2}\right)\), where the meaning of symbols is general.
Differentiate between primary and secondary rainbows.
A convex lens of refractive index 1.5 is kept in a liquid medium having same refractive index. What is the focal length of the lens in this medium?
The critical angle for total internal reflection of a ray from any medium to vacuum is 30\(^{\circ}\). Then velocity of light in the medium will be
The coefficient of reflection for total internal reflection will be
A spherical mirror is immersed in water. Its focal length will
A convex lens of focal length 40 cm and a concave lens of focal length 20 cm are in contact. The power of their combination in dioptre is
The dispersive power of a prism depends on
The radius of curvature of each surface of a biconvex lens is 20 cm and the refractive index of the material of the lens is 1.5. The focal length of the lens is