Two convex lenses of power 6 m − 1 6\ m^{-1} 6 m − 1 and 10 m − 1 10\ m^{-1} 1 0 m − 1 are placed in contact. Calculate the combined power and the focal length of the combination.

P = 16 m − 1 , f = 6.25 c m P\ =16\ m^{-1}\ ,\ f\ =\ 6.25\ cm P = 1 6 m − 1 , f = 6 . 2 5 c m

P = − 16 m − 1 , f = 6.25 c m P\ =\ -\ 16\ m^{-1}\ ,\ f\ =\ 6.25\ cm P = − 1 6 m − 1 , f = 6 . 2 5 c m

P = 6 m − 1 , f = 0.6 c m P\ =\ 6\ m^{-1}\ ,\ f\ =\ 0.6\ cm P = 6 m − 1 , f = 0 . 6 c m

P = − 6 m − 1 , f = 6 c m P\ =\ -6\ m^{-1\ },\ f\ =\ 6\ cm P = − 6 m − 1 , f = 6 c m

A concave (diverging) lens of power − 0.02 m − 1 -0.02\ m^{-1} − 0 . 0 2 m − 1 and a convex (converging) lens of power 0.05 m − 1 0.05\ m^{-1} 0 . 0 5 m − 1 are placed in contact. Find the power of the combination of the lenses. Does the combination behave as a convex or concave lens?

P = 0.03 m − 1 P\ =\ 0.03\ m^{-1} P = 0 . 0 3 m − 1

P = − 0.03 m − 1 P\ =\ -0.03\ m^{-1} P = − 0 . 0 3 m − 1

P = 3 m − 1 P\ =\ 3\ m^{-1} P = 3 m − 1

P = − 3 m − 1 P\ =\ -\ 3\ m^{-1} P = − 3 m − 1

8.04: Lenses: Power of a Lens

Authored by Naoise Gallagher

Physics

11th - 12th Grade

Used 31+ times

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The power of a lens is positive for a ...

Concave (Diverging) Lens

Convex (Converging) Lens

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The power of a lens is negative for a ...

Convex (Diverging) Lens

Concave (Converging) Lens

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The formula for the power of a lens is...

$P\ =\ 1\ +\ f$

$P\ =\ 1\ -\ f$

$P\ =\ \frac{1}{f}$

$P\ =\ \frac{1}{1\ +\ f}$

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Calculate the power of a convex (converging) lens of focal length 40 cm

+ 2.5 m^-1

- 2.5 m^-1

+ 2.5 cm^-1

- 2.5 cm^-1

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Calculate the power of a concave lens of focal length 60 cm

$-1.67\ m^{-1}$

$+1.67\ m^{-1}$

$-1.67\ cm^{-1}$

$+\ 1.67\ cm^{-1}$

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A lens has a power of 12 m^-1. Calculate its focal length

8.33 cm

12.45 cm

0.8 m

7.5 cm

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A diverging lens has a power of
$-\ 0.025\ m^{-1}$ . Calculate its focal length.

4 m

40 m

0.4 m

40 cm

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Two convex lenses of power $6\ m^{-1}$ and $10\ m^{-1}$ are placed in contact. Calculate the combined power and the focal length of the combination.

$P\ =16\ m^{-1}\ ,\ f\ =\ 6.25\ cm$

$P\ =\ -\ 16\ m^{-1}\ ,\ f\ =\ 6.25\ cm$

$P\ =\ 6\ m^{-1}\ ,\ f\ =\ 0.6\ cm$

$P\ =\ -6\ m^{-1\ },\ f\ =\ 6\ cm$

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

A concave (diverging) lens of power $-0.02\ m^{-1}$ and a convex (converging) lens of power $0.05\ m^{-1}$ are placed in contact. Find the power of the combination of the lenses. Does the combination behave as a convex or concave lens?

$P\ =\ 0.03\ m^{-1}$

$P\ =\ -0.03\ m^{-1}$

$P\ =\ 3\ m^{-1}$

$P\ =\ -\ 3\ m^{-1}$

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8.04: Lenses: Power of a Lens

The power of a lens is positive for a ...

The power of a lens is negative for a ...

The formula for the power of a lens is...

Calculate the power of a convex (converging) lens of focal length 40 cm

Calculate the power of a concave lens of focal length 60 cm

A lens has a power of 12 m-1. Calculate its focal length

A diverging lens has a power of − 0.025 m−1-\ 0.025\ m^{-1}− 0.025 m−1 . Calculate its focal length.

Two convex lenses of power 6 m−16\ m^{-1}6 m−1 and 10 m−110\ m^{-1}10 m−1 are placed in contact. Calculate the combined power and the focal length of the combination.

A concave (diverging) lens of power −0.02 m−1-0.02\ m^{-1}−0.02 m−1 and a convex (converging) lens of power 0.05 m−10.05\ m^{-1}0.05 m−1 are placed in contact. Find the power of the combination of the lenses. Does the combination behave as a convex or concave lens?

A combination of two convex lenses has a focal length of 20 cm. If the focal length of one of the lenses is 60 cm, what is the focal length of the other?

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Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Physics

A lens has a power of 12 m^-1. Calculate its focal length

A diverging lens has a power of
$-\ 0.025\ m^{-1}$ . Calculate its focal length.

Two convex lenses of power $6\ m^{-1}$ and $10\ m^{-1}$ are placed in contact. Calculate the combined power and the focal length of the combination.

A concave (diverging) lens of power $-0.02\ m^{-1}$ and a convex (converging) lens of power $0.05\ m^{-1}$ are placed in contact. Find the power of the combination of the lenses. Does the combination behave as a convex or concave lens?