What is the focal length of a convex lens, Physics

Assignment Help:

Q. What is the focal length of a convex lens of focal length 30 cm in contact with a Concave lens of focal length 20 cm ? Is the system a converging or a diverging lens?

Ignore thickness of the lenses.

Answer

A Focal length of the convex lens f1 = 30cm

A Focal length of the concave lens f2 = - 20cm

A  Focal length of the system of lenses = f

The equal focal length of a system of two lenses in contact is given as

656_What is the focal length of a convex lens.png

Hence the focal length of the combination of lenses is 60 cm. The negative sign specifies that the system of lenses acts a diverging lens.


Related Discussions:- What is the focal length of a convex lens

Calculate the entropy change for this process, 6.1 moles of  steam at 100 ...

6.1 moles of  steam at 100 o C are condensed at 100 o C and the resulting water is cooled to 47.1 o C. Calculate the entropy change for this process. (The molar heat capac

Important parts of an ac dynamo, 1)The armature ABCD consists of a copper w...

1)The armature ABCD consists of a copper wire wound on cylindrical soft-iron core.The armature can be rotated horizontal axis perpendicular to magnetic field. 2)NS is permanent

Types of bond: vander waals bond, VANDER WAALS BOND: A fourth type of b...

VANDER WAALS BOND: A fourth type of bonding, which does not involve a transfer or sharing of electrons, is known as the Vander walls bond. It forms in atoms or molecules that b

Find the resistance r in the circuit, The current is an RL circuit drops fr...

The current is an RL circuit drops from 1.1 A to 13 mA in the first second following removal of the battery from the circuit. If L is 12H, find the resistance R in the circuit.

Newton law, Newton 2nd law of motion proof

Newton 2nd law of motion proof

Instantaneous speed and velocity, Instantaneous velocity and speed are expl...

Instantaneous velocity and speed are explained at a given or particular instant and are shown by  ,

The liquid calculates milliliter, The liquid calculates milliliter, mL, is ...

The liquid calculates milliliter, mL, is the same as 1 cm 3 . How many milliliters of liquid can be held in a 2.5-m 3 container?

Mean life, WE are estimating the spares requirement for a radar power suppl...

WE are estimating the spares requirement for a radar power supply. The power supply was designated with a mean life of 6500 hours. the standard deviation determined from testing is

Sigma, with surface charge density sigma

with surface charge density sigma

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd