A needle placed 45 cm from a lens forms an image on a screen placed 90 cm on the other side of lens, focal length and type of lens is (A) +10cm, Convex lens (B) +30cm, Convex lens (C) +30cm, Concave lens (D) +10cm, Concave lens

A needle placed 45 cm from a lens forms an image on a screen placed 90

1.	A needle placed 45 cm from a lens forms an image on a screen placed 90 cm on the other side of lens, focal length and type of lens is (A) +10cm, Convex lens (B) +30cm, Convex lens (C) +30cm, Concave lens (D) +10cm, Concave lens
Answer» (B) +30cm, Convex lens

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A needle placed 45 cm from a lens forms an image on a screen placed 90 cm on the other side of lens, focal length and type of lens is (A) +10cm, Convex lens (B) +30cm, Convex lens (C) +30cm, Concave lens (D) +10cm, Concave lens

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