AI Mentor

Check Your IQ

Free Expert Demo

Try Test

Courses

Dropper NEET Course Dropper JEE Course Class - 12 NEET Course Class - 12 JEE Course Class - 11 NEET Course Class - 11 JEE Course Class - 10 Foundation NEET Course Class - 10 Foundation JEE Course Class - 10 CBSE Course Class - 9 Foundation NEET Course Class - 9 Foundation JEE Course Class -9 CBSE Course Class - 8 CBSE Course Class - 7 CBSE Course Class - 6 CBSE Course

Offline Centres

A student forms an image of a candle flame on a white screen using a convex lens. He noted down the position of the candle, the screen and the lens as under
Position of candle = $12 cm$
Position of convex lens = $50 cm$

Position of the screen = $88 cm$

Focal length of the convex lens will be ____ $cm$ .

see full answer

Your Exam Success, Personally Taken Care Of

1:1 expert mentors customize learning to your strength and weaknesses – so you score higher in school , IIT JEE and NEET entrance exams.

An Intiative by Sri Chaitanya

(Unlock A.I Detailed Solution for FREE)

Best Courses for You

JEE

NEET

Foundation JEE

Foundation NEET

CBSE

Detailed Solution

A student forms an image of a candle flame on a white screen using a convex lens. Focal length of the convex lens will be

19 cm .

Given that,
u = distance of candle from the lens.

\Rightarrow (50 - 12) cm = 38 cm .

According to sign convention,
Object distance, u =

- 38 cm

Now,

v

is the distance of image from the lens

\Rightarrow (88 - 50) = 38 cm .

As per sign convention,
v = +

38 cm

Using lens formula,

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

\frac{1}{f} = \frac{1}{38} + \frac{1}{38}

f = \frac{38}{2} = 19 cm

Watch 3-min video & get full concept clarity

courses

No courses found

Result Producing online coaching for JEE/NEET of south India

Largest All India Test Series for JEE/NEET

Best Online Course for IIT JEE

Best Online Course for NEET

Best Online Course for CBSE

Ready to Test Your Skills?

Check your Performance Today with our Free Mock Test used by Toppers!

Take Free Test

Get Expert Academic Guidance – Connect with a Counselor Today!