A concave, spherical mirror and a thin, converging lens are both measured in air (n=1.0) to have the same focal length, ff. Both the mirror and the lens are then placed under water (n=1.33) and their focal lengths are measured again.
For both the mirror and the lens state whether its focal length under water will be the same, longer or shorter than ff and in both cases give a reason for your answer.

  1. 👍 2
  2. 👎 0
  3. 👁 787
  1. the focal length of the concave mirror stays the same.

    The focal length of the converging lens gets shorter.

    the index of refraction is not a factor in the concave mirror's focal point. However, it is a factor in the converging lens' focal point, as seen in the Lens Maker's Equation, or Snell's law.

    1. 👍 4
    2. 👎 1

Respond to this Question

First Name

Your Response

Similar Questions

  1. Physics(Thank you)

    1)Which of the following objects can set fire to a piece of paper in the presence of sunlight? A)doulble concave lens B)convex lens C)convex mirror D)concave lens B, convex lens 2)What happens to a path of a light ray parallel to

    asked by Jon on April 8, 2008
  2. physics

    A 5.0-cm real object is placed at a distance of 30.0 cm from a concave mirror of focal length 10.0 cm. Find the location of the image. A. 6 cm B. 10 cm C. 15 cm D. 60 cm Is it B. 10 cm? Which of the following objects can set fire

    asked by sophie on April 6, 2009
  3. Physics

    An object is placed 19.6 cm to the left of a diverging lens (f = -7.84 cm). A concave mirror (f = 11.2 cm) is placed 27.3 cm to the right of the lens Find the final image distance, measured relative to the mirror (cm)

    asked by Elizabeth on April 23, 2013
  4. Physics

    An object is placed 30mm in front of a lens. An image of the object is located 90mm behind the lens. a) Is the lens converging or diverging? explain. b) What is the focal length of the lens? c) Draw a diagram with lens at x=0,

    asked by Harly on May 30, 2011
  5. Physics

    An object is placed in front of a converging lens in such a position that the lens (f = 13.2 cm) produces a real image located 23.5 cm from the lens. Then, with the object remaining in place, the lens is replaced with another

    asked by Elle on December 1, 2014
  6. 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
  7. Physics

    A converging thin lens made out of crown glass (n=1.52) has a focal length f=1.0m An identical lens (same radius for the spherical surfaces), made out of a high-index plastic with n=1.70 will be ... A. Converging with a focal

    asked by mm on March 27, 2010
  8. Physics

    Two systems are formed from a converging lens and a diverging lens, as shown in parts a and b of the drawing. (The point labeled "Fconverging" is the focal point of the converging lens.) An object is placed inside the focal point

    asked by Damien O' Connell on March 18, 2015
  9. physics

    Hi! could any help me please, thank you. 1.An object is placed 17.8 cm from a first converging lens of focal length 13 cm. A second converging lens with focal length 24 cm is placed 10 cm to the right of the first converging lens.

    asked by Chan on April 18, 2010
  10. Physics

    Optics/Lens problem. Is the image real or virtual? A converging lens of focal length f1 = +22 .5cm is placed at a distance d = 60 .0cmtotheleft of a diverging lens of focal length f2 = −30.0cm. An object is placed on the common

    asked by Anon on March 21, 2018

More Similar Questions