Question

SUMMER BREAK ASSIGNMENT
CLASS-X(PHYSICS) Light Reflection and Refraction (5 MARKS)
Q1- A convex lens of focal length 15 cm forms an image 10 cm from the lens. How far is the object
from the lense draw the ray diagram​

Answer 1

maybe help in your question

thank you

Answer 2

$\mathfrak{\large{\underline{\underline{Given:-}}}}$

Focal length of convex lens = +15 cm

image distance (v) = - 10 cm

$\mathfrak{\large{\underline{\underline{To find:-}}}}$

object distance = ?

$\mathfrak{\large{\underline{\underline{Solution:-}}}}$

By using lens formula we have,

$\boxed{\sf{</strong><strong>\frac{1}{f} = \frac{1}{v} - \frac{1}{u} </strong><strong>}}$

Now, put the value,

$\implies$ $\frac{1}{u} = \frac{1}{v} - \frac{1}{f}$

$\implies$ $\frac{1}{u} = \frac{ - 1}{10} - \frac{1}{15}$

$\implies$ $\frac{1}{u} = \frac{ - 3 - 2}{30}$

$\implies$ $\frac{1}{u} = \frac{ - 5}{30}$

$\implies$ $u = - 6cm$

If the image distance is positive the n the question becomes wrong.

hence, the object distance from the lens is -6 cm.