## Question

A ray is incident at an angle of incidence *i* on one face of a prism of small angle *A* and emerges normally from the opposite surface. If the refractive index of the material of the prism is μ, the angle of incidence *i* is nearly equal to:

### Solution

As the ray emerges normally, hence *e* = 0.

#### SIMILAR QUESTIONS

The distance between an object and the screen is 100 cm. A lens produces an image on the screen when placed at either of the positions 40 cm apart. The power of the lens is:

A thin equiconvex lens has focal length 10 cm and refractive index 1.5. One of its faces is now silvered and for an object placed at a distance *u* in front of the lens, the image coincides with the object. The value of *u* is:

The plane face of a plano-convex lens of focal length 20 cm is silvered. What type of mirror will it become and of what focal length *f *?

A convex lens of focal length 20 cm is cut into two equal parts so as to obtain two plano-convex lenses as shown in figure. The two parts are then put in contact as shown in figure. What is the focal length of the combination?

As shown in figure, a convergent lens is placed inside a cell filled with liquid. The lens has focal length +20cm when in air, and its material has refractive index 1.50. If the liquid has refractive index 1.60, the focal length of the system is:

A plano-convex lens of *f* = 20 cm is silvered at plane surface. Now, *f* will be (μ = 1.5):

The plane face of a plano-convex lens is silvered. If μ be the refractive index and *R*, the radius of curvature of curved surface, then the system will behave like a concave mirror of radius of curvature:

A convex lens of focal length *f* is placed somewhere in between an object and a screen. The distance between the object and the screen is *x*. If the numerical value of the magnification produced by the lens is *m*, the focal length of the lens is:

A ray of light suffers minimum deviation when incident on a 60^{o} prism of refractive index The angle of incidence is:

The refracting angle of a prism is *A* and the refractive index of the prism is cot (A/2). The angle of minimum deviation is: