| ⇦ | 
| ⇨ |
A concave lens of focal length f forms an image which is 1/3 times the size of the object. Then, the distance of object from the lens is
Options
(a) 2f
(b) f
(c) 2/3f
(d) 3/2f
Correct Answer:
2f
Explanation:
Given, f = -f ⇒ v = (1/3)u
According to the lens formula, 1/f = (1/v) – (1/u) – (1/f)
= [1/(-1/2)u] + (1/u) – (1/f) 1/f
= [(-3+1)/u] – (1/f)
= -2/u ⇒ u = 2f
Related Questions: - If the terminal speed of a sphere of gold (density=19.5 kg/m³) is 0.2 m/s
- The self induced e.m.f. in a 0.1 H coil when the current in it is changing
- Angle of minimum deviation for a prism of reractive index 1.5 equal to the angle
- A potentiometer wire of length L and a resistance r are connected in series with
- The earth is assumed to be a sphere of radius R. A platform is arranged at a height R
Topics: Ray Optics
(94)
Subject: Physics
(2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
- If the terminal speed of a sphere of gold (density=19.5 kg/m³) is 0.2 m/s
- The self induced e.m.f. in a 0.1 H coil when the current in it is changing
- Angle of minimum deviation for a prism of reractive index 1.5 equal to the angle
- A potentiometer wire of length L and a resistance r are connected in series with
- The earth is assumed to be a sphere of radius R. A platform is arranged at a height R
Topics: Ray Optics (94)
Subject: Physics (2479)
Important MCQs Based on Medical Entrance Examinations To Improve Your NEET Score
18000+ students are using NEETLab to improve their score. What about you?
Solve Previous Year MCQs, Mock Tests, Topicwise Practice Tests, Identify Weak Topics, Formula Flash cards and much more is available in NEETLab Android App to improve your NEET score.
Share this page with your friends
Leave a Reply