Physica

What is the value of the focal length fn2
of a convergent lens with index of refraction ( n2 =1.5) if it was
fn1 =5cm for an index of refraction n1 = 1.4 .

1. 👍 0
2. 👎 0
3. 👁 159
1. f is inversely proportional to 1/(N-1).

fn2/fn1 = .4/.5 = 0.8

fn2 = 4 cm

1. 👍 0
2. 👎 0

Similar Questions

1. calculus

If f is the focal length of a convex lens and an object is placed at a distance p from the lens, then its image will be at a distance q from the lens, where f, p, and q are related by the lens equation 1/f = 1/p + 1/q What is the

asked by Sam on May 6, 2011
2. science

Which of the following adjustments would cause an image to change from real to virtual? a)moving the object from the focal point of a converging lens to a position inside the focal length b)moving the object from the focal point

asked by Hi on April 30, 2020
3. science

Which of the following arrangements will create an image larger than the object? a diverging lens with the object placed between the focal point and the lens a converging lens with the object placed between the focal point and the

asked by dianni on January 23, 2019
4. Physics

An object is placed 20.0 cm from a thin converging lens along the axis of the lens. If a real image forms behind the lens at a distance of 8.00 cm from the lens, what is the focal length of the lens?

asked by Lauryn on February 2, 2017
5. physics

A convex meniscus lens is made of glass with refractive index, n= 1.5. The radius of curvature of the concave surface is 46.2 cm and the radius of curvature of the convex surface is 22.4 cm. a)Calculate the focal length of the

asked by aiman on August 15, 2015
1. Physics

An object is placed at a distance of 60 cm from a converging lens with a focal length of 20cm. What is the magnification of the lens?

asked by Lance on April 10, 2018
2. physics

The convex meniscus lens has a 15cm radius for the convex surface and 20cm for the concave surface. The lens is made of crown glass with refractive index, n=1.52 and is surrounded by air. What is the focal length of the lens.

asked by aiman on August 15, 2015
3. CALCULUS

If you could give an explenation with the answers, that'd be wonderful so I actually know how to solve similar problems in the future. :) Thank you so much! 1. A convex lens with focal length f centimeters will project the image

asked by Samantha on November 10, 2013
4. Physics

The crystalline lens of the human eye is a double convex lens made of material haveing an index of refraction of 1.44. Its focal length in air is about 8 mm which also varies. We shall assume that the radii of curvature of its two

asked by J on April 7, 2008
5. Physics

An object 20cm high is placed 40cm from a lens of focal length 24cm. Calculate: a) The power of the Lens? b) The distance from the lens to the position of the image?

asked by Joseph on March 7, 2016
6. Physics

An image of a candle is produced by a convex lens 14 cm away. If the focal length of the lens is 7 cm, how far from the lens is the candle placed? (USe the thin lens equation) For this question, how would you know whether the

asked by Emily on May 27, 2010