Light & Optics MCQs with Answers

One-liner

When an opaque object is moved closer to the light source, its shadow gets bigger.

One-liner

A convex lens is used to correct farsightedness (hyperopia) because it converges light rays onto the retina.

One-liner

Blue (and violet) light has the shortest wavelength among visible colors, while red has the longest.

One-liner

In irregular reflection, light rays reflect at different angles due to the rough or uneven nature of the reflecting surface.

One-liner

Convex lenses are also known as converging lenses because they bend parallel light rays inward to meet at a focal point.

One-liner

A photon of violet light has the greatest energy because violet light has the shortest wavelength (and highest frequency) among visible light, and photon energy is directly proportional to frequency.

One-liner

When the resulting intensity is greater than the individual intensities of two waves, it is called constructive interference.

One-liner

Laser light is more coherent because its waves are all in phase, have the same frequency, and travel in the same direction.

One-liner

The focal length of a thin convex lens is greater than that of a thick convex lens because a thinner lens has less curvature and bends light less sharply.

One-liner

The core of an optical fiber is made of glass (specifically silica glass), which allows light to travel through it by total internal reflection.