Electrostatic Potential and Capacitance — Physics STD 12 Science — Question

A glass slab is placed in the path of beam of convergent light. The point of convergence of light:

How does the potential difference change with the effect of the dielectric when the battery is kept disconnected from the capacitor?

According to Bohr’s model of hydrogen atom:

Assertion  :   Sun is at the galactic centre C of the milky way
Reason      :  All planets of solar system revolve around the sun.(a) If both assertion and reason are true and the reason is the correct explanation of the assertion.(b) If both assertion and reason are true but reason is not the correct explanation of the assertion.(c) If assertion is true but reason is false.(d) If assertion is false but reason is true.

A light beam is being reflected by using two mirrors, as in a periscope used in submarines. If one of the mirrors rotates by an angle q, the reflected light will deviate from its original path by the angle(a) 2θ(b) 0°(c)  θ(d) 4θ

Angular  width (b) of central maximum of a diffraction pattern on a single slit does not depend upon(a) Distance between slit and source(b) Wavelength of light used(c) Width of the slit(d) Frequency of light used

A galvanometer can be converted into an ammeter by connecting(a) Low resistance in series(b) High resistance in parallel(c) Low resistance in parallel(d) High resistance in series

Huygen's conception of secondary waves(a) Allow us to find the focal length of a thick lens(b) Is a geometrical method to find a wavefront(c) Is used to determine the velocity of light(d) Is used to explain polarisation