Geometrical Optics: Master Light and Optics for Electrical Engineering

Question 1

A ray of light strikes a plane mirror at an angle of incidence of 30 degrees. Calculate the angle of reflection.

Accepted Answer

30 degrees

Answer

60 degrees

Answer

45 degrees

Answer

90 degrees

Question 2

A convex lens with a focal length of 10 cm is used to form an image of an object placed 20 cm away from the lens. Determine the distance between the lens and the image formed.

Accepted Answer

15 cm away from the lens on the other side

Answer

20 cm away from the lens on the other side

Answer

10 cm away from the lens on the same side

Answer

30 cm away from the lens on the same side

Question 3

Which condition is NOT necessary for total internal reflection to occur?

Accepted Answer

Light travels from a less dense medium to a denser medium.

Answer

All of the light is completely reflected back into the denser medium.

Answer

The angle of incidence is greater than the critical angle.

Question 4

A compound microscope has an objective lens with a focal length of 5 mm and an eyepiece lens with a focal length of 10 mm. The distance between the lenses is 15 cm. Calculate the magnification of the microscope.

Accepted Answer

150x

Answer

600x

Answer

50x

Answer

300x

Question 5

A beam of monochromatic light with a wavelength of 600 nm is incident on a diffraction grating with 500 lines per millimeter. Determine the first-order diffraction angle.

Accepted Answer

10 degrees

Answer

300 nm

Answer

1200 nm

Answer

900 nm

Question 6

A ray of light is incident on a glass-air interface at an angle of incidence of 45 degrees. If the index of refraction of glass is 1.5, calculate the angle of refraction.

Accepted Answer

29.5 degrees

Answer

35 degrees

Answer

40 degrees

Question 7

A concave mirror has a radius of curvature of 20 cm. An object is placed 10 cm away from the mirror. Locate the image formed.

Accepted Answer

10 cm behind the mirror

Answer

10 cm in front of the mirror

Answer

20 cm behind the mirror

Answer

20 cm in front of the mirror

Question 8

Which of the following is a distinctive property of electromagnetic radiation?

Accepted Answer

It is a transverse wave.

Answer

It travels at the speed of sound.

Answer

It requires a medium to propagate.

Question 9

A plano-convex lens with a focal length of 15 cm is used to form an image of an object placed 30 cm away from the lens. Calculate the magnification of the image.

Accepted Answer

2x

Answer

3x

Answer

0.5x

Answer

4x

Question 10

A ray of light is incident on a prism at an angle of 40 degrees with respect to the normal. If the angle of deviation is 10 degrees, calculate the angle of emergence.

Accepted Answer

30 degrees

Answer

50 degrees

Answer

40 degrees

Answer

20 degrees