53. The refractive index of the material of the prism is √ 3; then the angle of minimum deviation of the prism is ?

34. A plano-convex lens is made of material of refractive index 1.6. The radius of curvature of the curved surface is 60 cm. The focal length of the lens is ?

16. Wavelength of light of frequency 100 Hz ?

A parallel plate condenser with oil between the plates (dielectric constant of oil K = 2 ) has a capacitance C. If the oil is removed, then capacitance of the capacitor becomes ?

What is the effective capacitance between the points X and Y ?