Assertion: If an object is placed at the centre of a glass sphere, and it is observed from outside. Then, it will appear at the centre itself.

Reason: All rays starting from object fall normal on the surface. Hence, they do not bend.

Assertion: Shining of diamond is due to the phenomenon of total internal reflection.

Reason: Refractive index of diamond is large. Hence, critical angle is small.

Assertion: Sun appears red during sunrise and sunset due to the phenomenon of refraction.

Reason: In refraction of light frequency of light remains unchanged.

Assertion: If an object is placed at a distance of $10 \mathrm{cm}$ from a convex mirror of focal length $10 \mathrm{cm}$. Then, its image is formed at infinity.

Reason: If an object is placed at the focus of a mirror its image is formed at infinity.

Assertion: Although the surfaces of goggle lens are curved, it does not have any power.

Reason:In case of goggles, both the curved surfaces have equal radii of curvature and have centre of curvature of the same side.

Assertion: Image formed by a convex mirror can never be real.

Reason: Convex mirror is diverging in nature.

Assertion: In Snell's law $\mu =\frac{\sin \left(i\right)}{\sin \left(r\right)}$, angle $i$ is always angle of incidence.

Reason: $\mu =\frac{\sin \left(i\right)}{\sin \left(r\right)}$ is applicable if the first medium is the air (or vacuum).

Assertion: Reflected image always travels in the opposite direction of object.

Reason: Speed of the point image formed by reflected rays is always equal to the speed of its point object.

Assertion: A ray of light travels from the first medium to a second medium. In the first medium angle of a ray with normal is $i_1=30°$ and in second medium $i_2=60°$ Then, the second medium is rarer medium.

Reason: Refractive index of the first medium with respect to the second medium is $\frac{\sin 30°}{\sin 60°}$.