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Q.

Which of the following always has a negative focal length?

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a

Convex mirror

b

Plano-convex lens

c

Convex lens

d

Concave mirror

answer is B.

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Detailed Solution

  • According to the sign convention, the distance measured on the left is always considered negative.
  • Question Image
  • As the focus is on the left of the concave mirror, the focal length will always be considered negative.

Therefore, concave mirror is the correct answer.

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