Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at curved surface/LensEasy2 minPYQ_2020
PhysicsEasysingle choice

A point objectOis placed on the principal axis of a convex lens of focal lengthf=20 cmat a distance of40 cmto the left of it. The diameter of the lens is10 cm. An eye is placed60 cmto the right of the lens and a distancehbelow the principal axis. The maximum value ofhto see the image is. (assume paraxial approximation to be valid here)

Options:

Answer:
B
Solution:



1 v = 1 f + 1 u

= 1 2 0 - 1 4 0 = 1 4 0

v = 40 cm



To locate field of view ray passing through upper end should be used. At location of eye, its height should not be below 20 tan θ from axis to see the image i.e., 2 0 5 4 0 = 2.5 cm

Subject:PhysicsTopic:Geometrical OpticsSubtopic:Refraction at curved surface/Lens
2mℹ️ Source: PYQ_2020

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