Optics Quiz

What is the difference between a dark spectrum and a bright spectrum?

• Dark spectrum has a higher frequency, while bright spectrum has a lower frequency.

• Dark spectrum is emitted, while bright spectrum is absorbed by a material.

• Dark spectrum is absorbed by a material, while bright spectrum is emitted.

• Dark spectrum has a longer wavelength, while bright spectrum has a shorter wavelength.

Answer explanation

Dark spectrum is absorbed by a material, while bright spectrum is emitted.

Where does the image of an object appear in a plane mirror?

• Behind the mirror

• On the mirror's surface

• In front of the mirror

• Next to the mirror

Answer explanation

The image of an object appears behind the mirror in a plane mirror. This is because light rays reflect off the mirror surface and form a virtual image behind the mirror.

What is the relationship between the object distance and the virtual image distance in a plane mirror?

• The virtual image distance is double the object distance

• They are equal

• The virtual image distance is triple the object distance

• The virtual image distance is half the object distance

Answer explanation

The relationship between the object distance and the virtual image distance in a plane mirror is that they are equal.

What is the image size compared to the object size in a plane mirror?

• The image size varies

• The image size is the same

• The image size is larger

• The image size is smaller

Answer explanation

The image size is the same

What type of image is produced by a concave mirror?

• Inverted

• Upright

• Rotated

• Enlarged

Answer explanation

Concave mirrors produce upright images.

What are the primary colors of light for color addition?

• Cyan, magenta, yellow

• Red, yellow, blue

• Green, purple, orange

• Red, blue, green

Answer explanation

The primary colors of light for color addition are red, blue, and green. When combined, they can create a wide range of colors through additive color mixing.

What happens when red light is subtracted from white light?

• White light is produced

• Yellow light is produced

• Magenta light is produced

• Cyan light is produced

Answer explanation

When red light is subtracted from white light, the remaining colors are cyan, which is why cyan light is produced.

What is the purpose of a convex lens in the human eye?

• To form a real image

• To form a rotated image

• To form a virtual image

• To form an inverted image

Answer explanation

The purpose of a convex lens in the human eye is to form a real image.

What determines the properties of the image produced by a convex lens?

• Size of the lens

• Material of the lens

• Color of the object

• Location of the object

Answer explanation

The properties of the image produced by a convex lens are determined by the location of the object.

What are the subtractive primary colors for color subtraction?

• Cyan, magenta, yellow

• Purple, orange, brown

• Red, blue, green

• Black, white, gray

Answer explanation

The subtractive primary colors for color subtraction are cyan, magenta, and yellow. These colors are used in printing and mixing pigments to create a wide range of colors.