ray-optics-and-optical-instruments Question 5
Question: Q. 1. When an object is placed between $f$ and $2 f$ of a concave mirror, would the image formed be (i) real or virtual and (ii) diminished or magnified? $\mathrm{U}$ [Delhi I, II, III 2015]
Show Answer
Solution:
Ans. (i) Real, (ii) magnified
$1 / 2+1 / 2$
[AI Q. 2. Redraw the diagram given below and mark the position of the centre of curvature of the spherical mirror used in the given set up.
A] [CBSE SQP 2014]
$$ \text { Ans. } $$
[CBSE Marking Scheme 2014]
Detailed Answer :
Line joining the object and image same point $\left(B & B^{\prime}\right)$ should be passes through $C$ as it is undeviated. As the image is enlarged and real from the mirror. It is concave mirror and object is placed between $C$ and $F$ and image is formed beyond $C$. Hence $C$ is in between object and the image.
Commonly Made Error
- Many candidates could not understand that $B B^{\prime}$ cut the principal axis at $C$. They arbitrarily choose $C$.
