PHYSICS [1 Mark Question Answer]

Angle of incidence is 0°. Since angle of incidence is’the angle between incident ray and normal. Direction of reflected ray is along BA opposite to the direction of incident ray.

A piece of paper appear black in sunlight. It would appear black when seen in red light because it absorbs light of all the colours.

A piece of paper appears white in sunlight because it reflects light of all the colours. It would appear red when viewed in red light.

If a red rose is seen in red light, it appears bright red. This is because the rose reflects the red light falling on it and absorbs none of it.

If a red rose is seen in green light, it appears black. The reason is that the rose absorbs the green light falling on it and reflect none.

Leaves appear green in white light because they reflect only the green light and absorb the light of all the other colours.

Speeds up

Speeds up

Slows down

Yes, light can travels in vacuum or air, a distance of nearly 299, 792, 458 metre (or nearly 3 x 108 metre) in one second. Thus, the speed of light in vacuum (or air) is 3 x 108 m s’1 nearly.

Objects are seen when light after striking them, returns in the same medium and reach our eyes.

Distance between me and my image is 4 metre.

Distance of image from the mirror is also 2 metre.

The image formed by a plane mirror is laterally inverted, upright, of the same size and is formed far behind the mirror as the object is in front of it.

The location of image of a point object is as far behind the mirror as the object is in front of it.

Reflection of light— When light strikes a polished surface it comes back in the same medium, is called reflection of light.