Student Login

Home›Chapters›Ray Optics PYQs›Spherical Surfaces & Thin Lenses›Question 66

JEE Main 2022 (28 Jul, Shift 2) · Spherical Surfaces & Thin Lenses

Spherical Surfaces & Thin Lenses question from JEE Main 2022 (28 Jul, Shift 2)

Q66JEE Main 2022 · 28 JUL · SHIFT 2Medium

Spherical Surfaces & Thin Lenses

In an experiment with a convex lens, The plot of the image distance $(v')$ against the object distance ( $u')$ measured from the focus gives a curve $v'u' = 225$ . If all the distances are measured in $\text{cm}$ . The magnitude of the focal length of the lens is ___________ cm.

Numerical answer type. Work it out, then open the answer.

Show answer and solution

Answer: 15

Newton's formula: $u'v' = f^2$ when distances are measured from the foci.
$f^2 = 225$
$f = 15$ cm

Report a mistake

More questions on Spherical Surfaces & Thin Lenses

The graph between 1/u and 1/v for a thin convex lens in order to determine its focal…JEE Main 2022 (26 Jul, Shift 1)
A convex lens is dipped in a liquid whose refractive index is equal to refractive index…MHT CET 2021 (21 Sep, Shift 2)
The refractive index of a converging lens is 1.4. What will be the focal length of this…JEE Main 2021 (16 Mar, Shift 2)
A convex lens of focal length f is used to form an image whose size is one fourth that of…MHT CET 2021 (20 Sep, Shift 2)
A convex lens of focal length 'F' produces a real image 'n' times the size of the object…MHT CET 2021 (20 Sep, Shift 1)
An object is placed at the focus of concave lens having focal length f. What is the…JEE Main 2021 (31 Aug, Shift 1)
The same size images are formed by a convex lens when the object is placed at 20 cm or at…JEE Main 2021 (25 Feb, Shift 1)
Region I and II are separated by a spherical surface of radius 25 cm. An object is kept…JEE Main 2021 (20 Jul, Shift 1)