Ray Optics Assessment - 1

How does the angle of minimum deviation of a glass prism of refractive index 1.5 change, if it is immersed in a liquid of refractive index 1.3 ? (Just type the magnitude)

For the same value of angle of incidence, the angles of refraction in three media A, B and C are 15°, 25° and 35°, respectively.

In which medium would the velocity of light be minimum?

• Velocity of light is minimum in medium A

• Velocity of light is minimum in medium B

• Velocity of light is minimum in medium C

A ray of light passing through an equilateral triangular glass prism from air undergoes minimum deviation when angle of incidence is 3/4^th of the angle of prism.

Calculate the speed of light in the prism

• 2.12 x 10⁸ m/s

• 1.42 x 10⁸ m/s

• 2.25 x 10⁸ m/s

• 1.32 x 10⁸ m/s

Calculate the distance of an object of height h from a concave mirror of focal length 10 cm

to obtain a real image of magnification 2.

(Type the unit)

The radii of curvature of the faces of a double convex lens are 10 cm and 15 cm.

If the focal length of the lens is 12 cm, find the refractive index of the material of the lens.

A small candle, 2.5 cm in size, is placed at 27 cm in front of a concave mirror of a radius of curvature 36 cm.

At what distance from the mirror should a screen be placed to obtain a sharp image?

(Type the unit)

A biconvex lens has a focal length 2/3 times the radius of curvature of either surface. Calculate the refractive index of lens material.

Find the radius of curvature of the convex surface of a plano-convex lens, whose focal length is 0.3 m, and the refractive index of the material of the lens is 1.5.

(Type the unit)

A 4.5 cm needle is placed 12 cm away from a convex mirror of focal length 15 cm.

Give the location of the image and the magnification.

(Type the unit)

Double-convex lenses are to be manufactured from glass with a refractive index of 1.55, having both faces with the same radius of curvature.

What is the radius of curvature required if the focal length is to be 20cm?

(Type the unit)