Mirror Formula and Magnification MCQs

Q1. The magnification produced by a plane mirror is +1. What does this mean?

• A.The image is real and inverted
• B.The image is virtual and erect
• C.The image is real and erect
• D.The image is virtual and inverted

Answer: B. The image is virtual and erect

What's the underlying rule? The image is virtual and erect. Does that line up with one of the options? Yes - This is the correct meaning of magnification +1. And the rest? option A) 'The image is real and inverted' misses the point - Plane mirrors produce erect images; option C) 'The image is real and erect' is wrong because Plane mirrors produce erect images. Pick: B) The image is virtual and erect.

Q2. If the object is at the centre of curvature of a concave mirror, the magnification is (NCERT):

• A.-1
• B.+1
• C.-2
• D.+2

Answer: A. -1

Start by listing the data - the numerical data stated in the question (physics, chapter 'Light - Reflection and Refraction'). Our target: the unknown asked. From the chapter we use the relation: hence the answer = -1. The arithmetic is: hence the answer = -1. An ionic bond forms when a metal donates electrons to a non-metal: e.g. So the correct choice is A) -1. As for the others, option B) '+1' misses the point - It is real inverted same-size => m = -1; option C) '-2' doesn't hold - Same size means |m| = 1, so m = -1.

Q3. In the mirror formula, u is the:

• A.object distance from the pole
• B.focal length
• C.image distance
• D.radius of curvature

Answer: A. object distance from the pole