Q17.A short straight object of height 100 cm lies before the central axis of a spherical mirror whose focal length has absolute value |f| = 40 cm . The image of object produced by the mirror is of height 25 cm and has the same orientation of the object. One may conclude from the information: (1) Image is real, same side of convex mirror. (2) Image is virtual, opposite side of concave mirror. (3) Image is real, same side of concave mirror. (4) Image is virtual, opposite side of convex mirror.
What This Question Tests
This question tests the application of magnification and mirror formulas along with sign conventions to determine the type of mirror and image characteristics (real/virtual, erect/inverted).
Concepts Tested
Formulas Used
m = -v/u = h_i/h_o
1/f = 1/v + 1/u
📚 NCERT Sections This Tests
9.15 — Apply Mirror Equation And The Condition:
Physics Class 12 · Chapter 9
9.15 Apply mirror equation and the condition: (a) f < 0 (concave mirror); u < 0 (object on left) (b) f > 0; u < 0 (c) f > 0 (convex mirror) and u < 0 (d) f < 0 (concave mirror); f < u < 0 to deduce the desired result.
9.1 — A Small Candle, 2.5 Cm In Size Is Placed At 27 Cm In Front Of A Concave
Physics Class 12 · Chapter 9
9.1 A small candle, 2.5 cm in size is placed at 27 cm in front of a concave mirror of radius of curvature 36 cm. At what distance from the mirror should a screen be placed in order to obtain a sharp image? Describe the nature and size of the image. If the candle is moved closer to the mirror, how would the screen have to be moved?
9.2 — A 4.5 Cm Needle Is Placed 12 Cm Away From A Convex Mirror Of Focal
Physics Class 12 · Chapter 9
9.2 A 4.5 cm needle is placed 12 cm away from a convex mirror of focal length 15 cm. Give the location of the image and the magnification. Describe what happens as the needle is moved farther from the mirror.
📋 Question Details
- Chapter
- Ray Optics
- Topic
- Spherical Mirrors
- Year
- 2021
- Shift
- 26 Feb Shift 1
- Q Number
- Q17
- Type
- MCQ
- NCERT Ref
- Class 12 Physics Ch 9: Ray Optics and Optical Instruments
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