Given u=10 cm,y=15 cm f1=y1−u1f1=151−101f1=15010−15f1=150−5f=−30 cm
A conversing beam of rays is incident on a diverging lens. Having passed though the lens the rays intersect at a point 15 ~cm from the lens on the…
NEET UG 2011 — Physics Optics
2011mcqmedium
A conversing beam of rays is incident on a diverging lens. Having passed though the lens the rays intersect at a point 15 cm from the lens on the opposite side. If the lens is removed the point where the rays meets will move 5 cm closer to the lens. The focal length of the lens is
Official previous-year question
Held on 30 Apr 2011 · Verified 9 Jul 2026.
Options
- A
−10 cm
- B
20 cm
- C
−30 cm
- D
5 cm
Did you get this right?
Sign in to track your attempts and accuracy.
Your note
Sign in to keep a private note on this question. Nothing you write is ever public.
NEET UG Optics in other years
More NEET UG Optics questions
Two thin lenses of focal lengths f₁ = +20 cm and f₂ = -10 cm are in contact. The power of the combination is:
2026easy
The refractive index of glass is 1.5. The speed of light in glass is:
2026easy
In a certain camera, a combination of four similar thin convex lenses are arranged axially in contact. Then the power of the combination and the total magnification in comparison to the power $(p)$ and magnification $(m)$ for each lens will be, respectively
2025medium
A microscope has an objective of focal length 2 cm , eyepiece of focal length 4 cm and the tube length of 40 cm . If the distance of distinct vision of eye is 25 cm , the magnification in the microscope is :
2025medium
The intensity of transmitted light when a polaroid sheet, placed between two crossed polaroids at $22.5^{\circ}$ from the polarization axis of one of the polaroid, is ( $\mathrm{I}_0$ is the intensity of polarised light after passing through the first polaroid):
2025medium
Other Physics topics for NEET UG
Keep practicing Optics
Work through every NEET UG Optics PYQ, year by year.