OAT Physics: Optics and Waves 5

Question 1

In a single-slit diffraction pattern, the width of the central maximum is affected by:

Accepted Answer

Both the wavelength and the slit width

Answer

The central maximum half-width is given by sinθ = λ/a, so it depends on both wavelength λ and slit width a.

Question 2

An object is placed inside the focal point of a converging lens. The image formed is:

Accepted Answer

Virtual, upright, and enlarged

Answer

When the object is inside the focal length, a converging lens acts as a magnifying glass, producing a virtual, upright, and enlarged image.

Question 3

The electromagnetic spectrum from longest to shortest wavelength is ordered as:

Accepted Answer

Radio, microwave, infrared, visible, UV, X-ray, gamma

Answer

From longest to shortest wavelength: radio > microwave > infrared > visible > ultraviolet > X-ray > gamma rays.

Question 4

Which of the following best describes polarization of light?

Accepted Answer

Light waves restricted to oscillate in a single plane

Answer

Polarization restricts the oscillation of the electric field of light to a single plane perpendicular to the direction of propagation.

Question 5

The frequency of a wave does NOT change when the wave:

Accepted Answer

Passes from one medium to another

Answer

When a wave passes from one medium to another, its frequency remains constant while its speed and wavelength change.

OAT - Optometry Admission Test Practice Test