The speed of light in a diamond is found to be $1,24,000 \mathrm{km} {\mathrm{s}}^{-1}$. What is the refractive index of a diamond? (Speed of light in air is $3\times {10}^8 \mathrm{m} {\mathrm{s}}^{-1}$)

Draw ray diagram of refraction of light through a prism.

Draw a ray diagram of the image formed by a concave mirror if the object placed at infinity.

Draw a ray diagram of the image formed by a concave mirror if the object placed between C and F.

Draw a ray diagram of the image formed by a concave mirror if the object placed at F.

Draw a ray diagram of the image formed by a concave mirror if the object placed between F and P.

Draw a ray diagram of the image formed by a concave mirror if the object placed at C.