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Saturday, 31 October

JEE Main 2022 · PhysicsNumerical answerNumerical valueMediumMulti-step

JEE Main 26 June 2022, Shift 1, Physics Q56

Question 56 of 90 in this shift, Physics question 26 of 30, Section B.

A light ray is incident, at an incident angle θ1\theta_1, on the system of two plane mirrors M1M_1 and M2M_2 having an inclination angle 75∘75^\circ between them (as shown in figure). After reflecting from mirror M1M_1 it gets reflected back by the mirror M2M_2 with an angle of reflection 30∘30^\circ. The total deviation of the ray will be __________ degree.

The figure, in words

Two plane mirrors M1 (slanted, hatched on its lower-left side) and M2 (horizontal, hatched below) meeting at a corner at the lower left with the angle 75 deg marked between them. A ray labelled 'incident ray' comes from the upper right toward M1, with an arrow at the point where it meets M1.

Official answer

210

NTA final key.

Chapter
Ray Optics and Optical Instruments
Topic
Spherical Mirrors
Idea tested
Multiple Reflections in Two-Mirror Systems

Same topic in other shifts

All Spherical Mirrors questions
  1. 4 Apr 2026, Shift 1 · Q39A rod of length 1010 cm lies along the principle axis of a concave mirror of focal length 1010 cm as shown in figure. The length of the…MediumDiagram basedHas a figure
  2. 6 Apr 2026, Shift 2 · Q50A concave mirror of focal length 10 cm forms an image which is double the size of object when the object is placed at two different…MediumNumerical value
  3. 2 Apr 2025, Shift 2 · Q36Two identical objects are placed in front of convex mirror and concave mirror having same radii of curvature of 12 cm, at same distance of…MediumSingle correct
  4. 4 Apr 2025, Shift 2 · Q39A finite size object is placed normal to the principal axis at a distance of 30 cm from a convex mirror of focal length 30 cm. A plane…MediumSingle correct
  5. 7 Apr 2025, Shift 2 · Q40A mirror is used to produce an image with magnification of 14\frac{1}{4}. If the distance between object and its image is 40 cm, then the…MediumSingle correct
  6. 29 Jan 2024, Shift 1 · Q49A convex mirror of radius of curvature 30 cm forms an image that is half the size of the object. The object distance is :EasySingle correct

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.