The correct answer is (d) 4 D.
The power of a lens (P) is given by the formula:
P=1f (in meters) in meters)
where f is the focal length in meters.
For a focal length of 25 cm:
f=0.25 m
P = =4diopters (D)
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90 Mins English English100 Questions100 Marks90 Mins English English40 Questions30 Marks25 Mins EnglishWhich of the following is NOT correct according to the sign convention for spherical lenses?
An object is placed 15 cm in front of a convex lens of focal length 25 cm. The image distance will be
Which type of lens is used to correct near sightedness ?
Which among the following represents the Lens formula?
A coin of diameter 4cm is placed at a distance of 45cm in front of a convex lens of focal length 30cm . Then the diameter of the image of the coin will be:
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