A concave mirror of focal length f produces a | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) For a concave mirror,the magnification $m$ is given by the formula $m = \frac{f}{f-u}$,where $f$ is the focal length and $u$ is the object distanc

Vedclass · Accepted Answer

$\left(\frac{n+1}{n}\right) f$

Vedclass · Answer

(C) For a concave mirror,the magnification $m$ is given by the formula $m = \frac{f}{f-u}$,where $f$ is the focal length and $u$ is the object distance.Since the image is real,the magnification $m$ must be negative. Given that the image size is $n$ times the object size,we have $m = -n$.Substituting this into the formula: $-n = \frac{-f}{-f-u}$.Multiplying both sides by $(-f-u)$,we get: $-n(-f-u) = -f$.$nf + nu = -f$.$nu = -f - nf$.$nu = -f(n+1)$.$u = -\frac{f(n+1)}{n}$.The distance of the object from the mirror is the magnitude of $u$,which is $|u| = \left(\frac{n+1}{n}\right) f$.

$A$ concave mirror of focal length $f$ produces an image $n$ times the size of the object. If the image is real,then the distance of the object from the mirror is:

Similar Questions

Which of the following is an example of a heterogeneous catalysis reaction?

The permissible use of the technique amniocentesis is for

Which of the following has the maximum boiling point?

$\int \frac{dx}{a^2 \sin^2 x + b^2 \cos^2 x}$ is equal to

If the mass defect of a nuclide is $3.32 \times 10^{-26} \ g$,its binding energy is (in $MeV$)?

Vedclass Test Series

Exam Paper Generator

Online Exam Module