Upper half of a convex lens is painted black. Will this lens be able to produce a complete image of an object placed in front of it? Will the the intensity of image be affected by painting? Explain.

Find the readings of voltmeter and ammeter

The refractive index of some substances are given in the table above. Answer the following. In which medium is the speed of light maximum?

The refractive index of some substances are given in the table above.
What is the refractive index (give answer up-to $3$ decimals) of medium $\mathrm{B}$ with respect to medium $\mathrm{A}$?

Give answer to three decimal places.

The refractive index of some substances are given in the table above. Answer the following. When light from medium $\mathrm{A}$enters obliquely to media $\mathrm{B}$, $\mathrm{C}$ and $\mathrm{D}$ at the same angle of incidence then in which case the angle of refraction will be maximum.