Question

if Crown glass slab is replaced with Flint glass slab in your experiment the critical angle will be increase or decrease

Answer 1

it will be decreased

Answer 2

The moon orbits Earth following a nearly circular path.

The gravitational pull of Earth on the moon is parallel to the velocity of the moon.

The moon orbits Earth in 1 Earth day.

The same face of the moon always points toward Earth.

The moon’s orbit is the result of the interaction between the moon’s inertia and the gravitational force from Earth.