Question

. The suitable focal length of the convex lens used as magnifying lens to read

“Hallmark 916’’ written on ornaments is :

A. 12 cm

B. 60 cm

C. 100 cm

D. 120 cm​

Answer 1

. The suitable focal length of the convex lens used as magnifying lens to read

“Hallmark 916’’ written on ornaments is :

A. 12 cm

B. 60 cm

C. 100 cm

D. 120 cm

Answer:-A. 12cm

Answer 2

The suitable focal length of the convex lens used as a magnifying lens to read “Hallmark 916’’ written on ornaments is A. 12 cm.

A. 12 cm:

The purity of gold is 916. A hallmark 916 is gold that has been certified as meeting a specific standard. The magnifying lens used to measure the hallmark is a convex lens that measures 12cm in length.

Explanation for the incorrect answer:

B. 60 cm: This is incorrect because The focal length of a convex lens used as a magnifying lens to read "Hallmark 916" written on ornaments cannot exceed 60 cm.

C. 100 cm: A convex lens used as a magnifying lens to read "Hallmark 916" written on ornaments cannot have a focal length of 100 cm. As a result, this is an incorrect answer.

D. 120 cm:

The focal length of a convex lens used as a magnifying lens to read "Hallmark 916" written on ornaments is 12 cm and it cannot be 120 cm. So this is the wrong answer.

As a result, a convex lens used as a magnifying lens to read "Hallmark 916" written on ornaments has a focal length of 12 cm.

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