A point source of light is placed on the prin | vedclass

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

Question

(B) concave lens is a diverging lens,which causes light rays to spread out as they pass through it. When the screen is placed very far away,the light

Vedclass · Accepted Answer

the light intensity on the screen continuously increases

Vedclass · Answer

(B) concave lens is a diverging lens,which causes light rays to spread out as they pass through it. When the screen is placed very far away,the light rays are spread over a large area,resulting in low intensity. As the screen is moved closer to the lens,the area covered by the diverging beam of light on the screen decreases. Since the total power (or number of photons) of the light source remains constant,the intensity (power per unit area) increases as the area of the illuminated spot on the screen decreases. Therefore,the light intensity on the screen continuously increases as it is brought closer to the lens.

$A$ point source of light is placed on the principal axis between $F$ and $2F$ of a concave lens. On the other side,very far away,a screen is placed perpendicular to the principal axis. As the screen is brought closer towards the lens,

Similar Questions

The distance $v$ of the real image formed by a convex lens is measured for various object distances $u$. $A$ graph is plotted between $v$ and $u$. Which one of the following graphs is correct?

$A$ concave lens of glass,refractive index $1.5$,has both surfaces of the same radius of curvature $R$. On immersion in a medium of refractive index $1.75$,it will behave as a:

An object is placed on the axis of a convex lens. Its image is formed $80 \, cm$ from the object. The magnification is $3$. The focal length of the lens is.....$cm$

$A$ convex lens having refractive index $1.6$ has a focal length of $12 \text{ cm}$ when it is in air. The focal length of that lens when placed in water is (refractive index of water = $1.28$) (in $\text{ mm}$)

Vedclass Test Series

Exam Paper Generator

Online Exam Module