OAT Physics: Optics and Waves 4

Question 1

A diverging lens always produces images that are:

Accepted Answer

Virtual, upright, and reduced

Answer

A diverging (concave) lens always produces virtual, upright, and reduced images regardless of object position.

Question 2

The phenomenon of diffraction is most pronounced when the wavelength of light is:

Accepted Answer

Comparable to or larger than the aperture

Answer

Diffraction effects are significant when the wavelength is comparable to or larger than the size of the aperture or obstacle.

Question 3

Two sources emit coherent light with wavelength 500 nm. For constructive interference, the path length difference must be:

Accepted Answer

Any integer multiple of λ

Answer

Constructive interference requires the path difference Δ = mλ where m = 0, ±1, ±2, … (integer multiples of the wavelength).

Question 4

Which property of light is demonstrated when polarized light passes through a second polarizer oriented at 90°?

Accepted Answer

Polarization (extinction)

Answer

When two polarizers are crossed (90° to each other), no light passes through, demonstrating the transverse polarization of light.

Question 5

A myopic (nearsighted) eye is corrected with a:

Accepted Answer

Diverging (concave) lens

Answer

Myopia is caused by the eye focusing images in front of the retina; a diverging lens diverges rays before they enter the eye, correcting this.

OAT - Optometry Admission Test Practice Test