A square cardboard of side 3, cm is placed 25 | vedclass

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

Question

(A) Given: Object side $s = 3\, cm$,Object area $A_0 = s^2 = 9\, cm^2$. Object distance $u = -25\, cm$,Focal length $f = -10\, cm$.Using the mirror fo

Vedclass · Accepted Answer

$4$

Vedclass · Answer

(A) Given: Object side $s = 3\, cm$,Object area $A_0 = s^2 = 9\, cm^2$. Object distance $u = -25\, cm$,Focal length $f = -10\, cm$.Using the mirror formula: $\frac{1}{v} + \frac{1}{u} = \frac{1}{f}$.$\frac{1}{v} = \frac{1}{-10} - \frac{1}{-25} = \frac{-5 + 2}{50} = \frac{-3}{50}$.So,$v = -\frac{50}{3}\, cm$.Linear magnification $m = -\frac{v}{u} = -\left(\frac{-50/3}{-25}ight) = -\frac{2}{3}$.Areal magnification $m_A = m^2 = \left(-\frac{2}{3}ight)^2 = \frac{4}{9}$.Image area $A_I = m_A 	imes A_0 = \frac{4}{9} 	imes 9 = 4\, cm^2$.

$A$ square cardboard of side $3\, cm$ is placed $25\, cm$ from a concave mirror of focal length $10\, cm$. What is the area enclosed by the image of the cardboard? (The plane of the cardboard is perpendicular to the principal axis.)

Similar Questions

Consider a concave mirror of $10 \,cm$ focal length illuminated by an object kept at a distance of $25 \,cm$. The distance at which the image is formed and its magnification respectively are

An object is placed at a distance of $40 \, cm$ from a concave mirror of focal length $15 \, cm$. If the object is displaced through a distance of $20 \, cm$ towards the mirror,the displacement of the image will be:

How is it convenient to obtain an image by reflection from a spherical mirror?

Provide the object and image distances,type,size,and magnification for an object placed in front of a concave spherical mirror for the cases shown in the image.

$A$ concave mirror is used to form an image of the Sun on a white screen. If the lower half of the mirror were covered with an opaque card,the effect on the image on the screen would be

Vedclass Test Series

Exam Paper Generator

Online Exam Module