Ask a Doubt
Request a call back

Join NOW to get access to exclusive study material for best results

CBSE Class 10 Answered

 

An object is placed 10 cm from a diverging lens which forms an image 6.5 cm from the lens. What is the focal length of the lens?

Asked by RAHUL rd | 22 Nov, 2014, 10:33: PM
answered-by-expert Expert Answer
Given that:
The object distance,u = -10cm
The image distance ,v= -6.5 cm
Let f be the focal length of the lens.
According to lens formula we know that:

begin mathsize 14px style 1 over straight f equals 1 over straight v minus 1 over straight u 1 over straight f equals fraction numerator 1 over denominator minus 6.5 end fraction minus fraction numerator 1 over denominator minus 10 end fraction 1 over straight f equals fraction numerator minus 10 minus minus 6.5 over denominator minus 6.5 cross times minus 10 end fraction equals fraction numerator minus 3.5 over denominator 65 end fraction straight f space equals minus 18.6 space cm end style

Given that it is a diverging lens ,i.e. concave lens.The focal length of a concave lens is - ve.
So the focal length of the lens =-18.6 cm
Answered by Jyothi Nair | 22 Nov, 2014, 11:59: PM

Application Videos

Concept Videos

Multiple Choice Questions Practice Test
Answered Unanswered My Questions My Answers
CBSE 10 - Physics
the angle between an incident ray and the reflecting surface is 55°. what will be the total angle between the incident and reflected ray?
Asked by ruchipandey20071978 | 11 May, 2023, 06:53: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
a concave mirror has a radius of curvature of 0.4m. find the position and size of the image of an object placed 0.2m high and is placed 0.8m in front of a concave mirror.
Asked by priyanshdhiman2008 | 17 Mar, 2023, 09:17: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
An object at distance of 24cm is placed in front of Concave. mirror having focal length 10cm. find image distance. Nature of image and magnification
Asked by piustoppo9thb | 24 Jun, 2022, 09:58: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
if a plane mirror is rotated by an angle of theta by how much will the angle between the incident and the reflected ray change?
Asked by priyankakiran2017 | 22 Jun, 2022, 07:07: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
Mirror formula
Asked by topperlearningforcontent | 02 Feb, 2022, 03:32: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
The distance between the real object and its image in a convex mirror of focal length 12 cm is 32 cm. the size of the object is 1cm. the object distance will be
Asked by bibektripathy17 | 15 Jun, 2021, 09:13: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
when we reverse the image then image will formed or not
Asked by vkpriya1228 | 24 Apr, 2021, 08:04: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
A REAL OBJECT IS LOCATED IS LOCATED AT ZERO END OF A METER STICK. A CONCAVE MIRROR LOCATED AT 100 cm END OF THE METER STICK FORMS AN IMAGE OF THE OBJECT AT THE 70cm POSITION. A CONVEX MIRROR PLACED AT THE 60cm POSITION FORMS A FINAL IMAGE AT THE 10 cm POINT WHAT IS THE RADIUS OF CURVATURE OF THE CONVEX MIRROR?
question image
Asked by iraza2663 | 21 Apr, 2021, 09:18: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
A concave mirror produces three times magnified (enlarged) real image of an object placed at 10cm in front of it . Where is the image located?
Asked by grexiemalinnie | 17 Jan, 2021, 09:15: AM
ANSWERED BY EXPERT ANSWERED BY EXPERT
CBSE 10 - Physics
why presently sign convention is known as new sign convention
Asked by alimohd1487 | 03 Jan, 2021, 06:40: PM
ANSWERED BY EXPERT ANSWERED BY EXPERT
My Class Videos Tests ₹ Plans Ask a Doubt
Get Latest Study Material for Academic year 24-25 Click here
×