Start Free Mock LoginAlready registered? Login here

Physics - Geometrical Optics Question with Solution | TestHub

PhysicsGeometrical OpticsRefraction at curved surface/LensMedium2 minQB

PhysicsMediumsingle choice

. The object-lens distance for a certain converging lens is 400 mm . The image is three times the size of the object. To make the image five times the size of the object-lens distance must be changed to:

Options:

Answer:

Solution:

With m = 3 (real image): v = 3u = 1200 mm, $\frac{1}{f} = \frac{1}{400} + \frac{1}{1200} = \frac{4}{1200} \Rightarrow f = 300 mm$ . For m = 5, v = 5u: $\frac{1}{300} = \frac{1}{u} + \frac{1}{5 u} = \frac{6}{5 u} \Rightarrow u = 360 mm$ . Hence (A).

Stream:JEESubject:PhysicsTopic:Geometrical OpticsSubtopic:Refraction at curved surface/Lens

⏱ 2mℹ️ Source: QB

Doubts & Discussion

Loading discussions...