(B) The power of a lens is given by the formula $P = \frac{1}{f}$,where $f$ is the focal length in meters.Given power $P = +1.5\, D$.Substituting the

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(B) The power of a lens is given by the formula $P = \frac{1}{f}$,where $f$ is the focal length in meters.Given power $P = +1.5\, D$.Substituting the value,$f = \frac{1}{1.5} = \frac{10}{15} = 0.666...\, m \approx 0.67\, m$.Converting to centimeters,$f = 0.67 \times 100 = 67\, cm$.$A$ lens with positive power and positive focal length is a convex lens.$A$ convex lens is a converging lens.

Class 10 Science Light – Reflection and Refraction Textbook - Light – Reflection and Refraction

Medium

$A$ doctor has prescribed a corrective lens of power $+1.5\, D.$ Find the focal length of the lens. Is the prescribed lens diverging or converging?

A
$67\, cm$; Diverging lens
B
$67\, cm$; Converging lens
C
$15\, cm$; Diverging lens
D
$15\, cm$; Converging lens

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Light – Reflection and Refraction

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Textbook - Light – Reflection and Refraction

Find the focal length (in $cm$) of a convex mirror whose radius of curvature is $32\, cm$.

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The refractive index of diamond is $2.42$. What is the meaning of this statement?

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$A$ spherical mirror and a thin spherical lens have each a focal length of $-15\,cm$. The mirror and the lens are likely to be

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Light enters from air to glass having refractive index $1.50$. What is the speed of light in the glass? The speed of light in vacuum is $3 \times 10^8 \, m \, s^{-1}$.

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Find out,from the table,the medium having the highest optical density. Also,find the medium with the lowest optical density.
Material medium Refractive index
Air $1.0003$
Ice $1.31$
Water $1.33$
Alcohol $1.36$
Kerosene $1.44$
Fused quartz $1.46$
Turpentine oil $1.47$
Benzene $1.50$
Crown glass $1.52$
Canada Balsam $1.53$
Rock salt $1.54$
Carbon disulphide $1.63$
Dense flint glass $1.65$
Ruby $1.71$
Sapphire $1.77$
Diamond $2.42$

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Material medium	Refractive index
Air	$1.0003$
Ice	$1.31$
Water	$1.33$
Alcohol	$1.36$
Kerosene	$1.44$
Fused quartz	$1.46$
Turpentine oil	$1.47$
Benzene	$1.50$
Crown glass	$1.52$
Canada Balsam	$1.53$
Rock salt	$1.54$
Carbon disulphide	$1.63$
Dense flint glass	$1.65$
Ruby	$1.71$
Sapphire	$1.77$
Diamond	$2.42$

$A$ doctor has prescribed a corrective lens of power $+1.5\, D.$ Find the focal length of the lens. Is the prescribed lens diverging or converging?

Similar Questions

Find the focal length (in $cm$) of a convex mirror whose radius of curvature is $32\, cm$.

The refractive index of diamond is $2.42$. What is the meaning of this statement?

$A$ spherical mirror and a thin spherical lens have each a focal length of $-15\,cm$. The mirror and the lens are likely to be

Light enters from air to glass having refractive index $1.50$. What is the speed of light in the glass? The speed of light in vacuum is $3 \times 10^8 \, m \, s^{-1}$.

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