A beam of light converges to a point P. Now a lens is placed on the path of the convergent beam 12 cm
from P. At what point does the beam converge if the lens is
(a) a convex lens of focal length 20 cm, (b) a concave lens of focal length 16 cm
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a) A convex lens of focal Lenght 20cm :-
Distance of object from lens (u) = 12 cm
Focal Lenght of convex lens (f) = 20 cm
Point at which beam converges (v) = ?
━━━━━━━━━━━━━━━━━━━━━━━━━
According to lens formula :-
i.e. , the image is formed on the right of the lens and is real .
━━━━━━━━━━━━━━━━━━━━━━━━━━
b) A concave lens of focal length 16 cm :-
Distance of object from lens (u) = 12 cm
focal length of concave lens (f) = 16 cm
Point at which beam converges (v) = ?
━━━━━━━━━━━━━━━━━━━━━━━━━
According to Lens Formula :-
i.e., The image is formed at 48 cm to the right of the lens where the beam would converge and is real
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