Reflection of Light

What is an optical object?

What are the application of optics?

Optics began with the development of lenses by the ancient Egyptians and Mesopotamians.

Optics is the branch of physics that studies the behaviour and properties of light.

Define optics.

Assertion(A): The formula connecting $u,v$ and $f$ for a spherical mirror is valid in all situations for all spherical mirrors for all positions of the object.
Reason (R): Laws of reflection are strictly valid for plane surfaces.

Which of the letter is noticeable for lateral inversion.

What is lateral inversion and how it forms.

Which objects emit their own light?

Which of the following letters doesn't suffer from lateral inversion? (C, O, B, N)

Angle of _____ is always equal to the angle of reflection.

This is the angle (in degree) of reflection when a ray of light falls normally on a plane mirror.

A group of light rays is known as a_____of light.

If we stand before a plane mirror and move our right hand, our image appears to move its left hand. In fact, our entire image is reserved sideways. This sideways reversal of the image is known as _____.

An object of size $7 \mathrm{cm}$ is placed at $27 \mathrm{cm}$ in front of a concave mirror of focal length $18 \mathrm{cm}$. At what distance from the mirror should a screen be placed so that a sharply focussed image can be obtained? Find the image size.

_____ (Angle of incidence/ Angle of reflection) is the angle made by the incident ray with the normal to the surface at the point of incidence.

A concave mirror produces three times enlarged image of an object placed at 10 cm in front of it. Calculate the focal length of the mirror.

A student wants to project the image of a candle flame on screen 48 cm in front of a mirror by keeping the flame at a distance of 12 cm from its pole then_____mirror he should use.

The ray of light that falls on the reflecting surface is called _____.

Light always travels along a _____ line.