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Saturday, 10 October

JEE Main 2020 · PhysicsMultiple choiceDiagram basedMediumDiagram reading

JEE Main 2 September 2020, Shift 1, Physics Q16

Question 16 of 75 in this shift, Physics question 16 of 25.

A spherical mirror is obtained as shown in the figure from a hollow glass sphere. If an object is positioned in front of the mirror, what will be the nature and magnification of the image of the object ? (Figure drawn as schematic and not to scale)

The figure, in words

Hollow glass sphere (dashed circle) with a portion on the right cut off as a mirror (hatched back, reflecting from inside); principal axis scale in cm marked 20, 16, 12, 8, 4 leftwards from the mirror pole; an object (upright arrow) placed on the axis at about 10 cm from the mirror.
  1. (1)Inverted, real and unmagnified
  2. (2)Erect, virtual and magnified
  3. (3)Inverted, real and magnifiedOfficial answer
  4. (4)Erect, virtual and unmagnified

Official answer

Option 3

NTA final key (Sep 2020).

Chapter
Ray Optics and Optical Instruments
Topic
Spherical Mirrors
Idea tested
Concave Mirror: Real Image Cases

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 42 of the 174 JEE Main shifts held from 2017 to 2026.