Question

Both a spherical mirror and a thin spherical lens have a focal length of (+)
20 cm. What type of mirror and lens are these?

Answer 1

Answer:

By convention, the focal length of a Convex mirror or a convex lens are taken as positive . Hence, both the spherical mirror and the thin spherical lens are convex in nature...

Explanation:

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Answer 2

Both the spherical mirror as well as the lens are convex in nature.

Mirrors and lens

• Mirrors are surfaces that support reflection of light whereas lens support refraction of a beam of light.
• By convention, the focal point of a lens or a mirror is said to be positive if it lies on the right side of the lens or mirror.
• Since the focal length for both the spherical lens and mirror is positive, the focus point must be on the right side of the mirror.
• This proves that both the spherical mirror as well as the lens are convex in nature.

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