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Saturday, 31 October

JEE Main 2022 · PhysicsMultiple choiceSingle correctMediumConceptual

JEE Main 27 June 2022, Shift 2, Physics Q46

Question 46 of 90 in this shift, Physics question 16 of 30, Section A.

A convex lens has power P. It is cut into two halves along its principal axis. Further one piece (out of the two halves) is cut into two halves perpendicular to the principal axis (as shown in figures). Choose the incorrect option for the reported pieces.

The figure, in words

Left: a biconvex lens outline with a dashed horizontal line across its middle and a dashed vertical line in its upper half. After a semicolon: three separate pieces, two thin narrow pieces side by side on top labelled L2 (left) and L3 (right), and a larger V-shaped lower piece labelled L1.
  1. (1)Power of L1_1 = P2\frac{P}{2}Official answer
  2. (2)Power of L2_2 = P2\frac{P}{2}
  3. (3)Power of L3_3 = P2\frac{P}{2}
  4. (4)Power of L1_1 = P

Official answer

Option 1

NTA final key.

Chapter
Ray Optics and Optical Instruments
Topic
Lens Maker's Formula
Idea tested
Cutting a Thin Lens

Same idea in other shifts

Asked 2× in all
  1. 13 Apr 2023, Shift 2 · Q59A bi convex lens of focal length 10 cm is cut in two identical parts along a plane perpendicular to the principal axis. The power of each…EasyNumerical value

Question text from the official JEE Main paper published by NTA; answer from the final answer key. Chapter, topic and idea tags, difficulty and skill are Lumi’s. This question needs a figure we do not reproduce; it is described in words above. Lumi analyses 108 of the 174 JEE Main shifts held from 2017 to 2026.