List of top Physics Questions on Ray optics and optical instruments asked in MET

When a lens is cut into two halves along \(XOX'\), then focal length of each half lens:

A ray falls on a prism \(ABC\) (AB = BC) and travels as shown in the figure. The minimum refractive index of the prism material should be:

The angle of a prism is \( A \). One of its refracting surface is silvered. If light rays falling at an angle of incidence \( 2A \) on the first surface returns back through the same path after reflection from silvered surface. The refractive index \( \mu \) of the prism is

If \( \vec{A}, \vec{B} \text{ and } \vec{C} \) are the unit vectors along the incident ray, reflected ray and outward normal to the reflecting surface, then:

The rays of sun are focussed on a piece of ice through a lens of diameter 5 cm, as a result of which 10 g ice melts in 10 min. The amount of heat received from sun, per unit area per minute is :

A concave lens is kept in contact with a convex lens of focal length \(20\,cm\). The combination works as a convex lens of focal length \(50\,cm\). The power of concave lens is:

The critical angle for glass-water interface (if \( \mu_g = \frac{3}{2}, \mu_w = \frac{4}{3} \)) is:

A convex lens of focal length \(0.12\,m\) produces an image which is three times the size of the object. The distance between the object and the lens for a real image is:

When a glass prism of refracting angle \(60^\circ\) is immersed in a liquid its angle of minimum deviation is \(30^\circ\). The critical angle of glass with respect to the liquid medium is:

A light ray from air is incident (as shown in figure) at one end of a glass fiber (refractive index \(\mu = 1.5\)) making an incidence angle of 60° on the lateral surface, so that it undergoes a total internal reflection. How much time would it take to traverse the straight fiber of length 1 km?

A point object O is placed in front of a glass rod having spherical end of radius of curvature 30 cm. The image would be formed at

In the formation of a rainbow light from the sun on water droplets undergoes

Light travelling from a transparent medium to air undergoes total internal reflection at an angle of incidence of 45°. Then refractive index of the medium may be

A thin convex lens of refractive index 1.5 has $20~\mathrm{cm}$ focal length in air. If the lens is completely immersed in a liquid of refractive index 1.6, its focal length will be}

The light ray is incident at angle of $60^{\circ}$ on a prism of angle $45^{\circ}$. When the light rays falls on the other surface at $90^{\circ}$, the refractive index of the material of prism $\mu$ and the angle of deviation $\delta$ are given by

A plano-convex lens is made of refractive index of 1.6. The radius of curvature of the curved surface is $60~\mathrm{cm}$. The focal length of the lens is

If refractive index of a material of equilateral prism is $\sqrt{3}$, then angle of minimum deviation of the prism is}

A thin rod of length \(\dfrac{f}{3}\) is placed along the optic axis of a concave mirror of focal length \(f\) such that its image is real and elongated and just touches the rod, the magnification is

When an equilateral prism of refractive index \(\sqrt{3}\) produces minimum deviation the angle of incidence at the first face must be

For a colour of light the wavelength for air is 6000 \AA\ and in water the wavelength is 4500 \AA. Then the speed of light in water will be

The angle of minimum deviation for a prism of angle \(A\) is \(180 - 2A\). The refractive index is

The angle of a prism is 60\(^\circ\) and its refractive index is \(\sqrt{2}\). The angle of minimum deviation suffered by a ray of light in passing through it is

The plane faces of two identical plano-convex lenses each having a focal length of 50 cm are placed against each other to form a usual biconvex lens. The distance from this lens combination at which an object must be placed to obtain a real, inverted image which has the same size as the object is

A ray of light is travelling through a medium of refractive index $\frac1\sqrt2}$ with respect to air. When it is incident on the surface making an angle $45^\circ$ with the surface, which of the following will take place?

In the system shown in figure $M₁ > M₂$ and pulley and threads are ideal. System is held at rest by thread BC. Just after thread BC is burnt.