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A plane convex lens of focal length 16 cm, is to be made of glass of refractive index 1.5. The radius of curvature of the curved surface should be
The maximum and minimum distance between a convex lens and an object, for the magnification of a real image to be greater than one are
A concave mirror of focal length f. in vacuum is placed in a medium of refractive index 2. Its focal length in the medium is
Medium doesn't effect focal length of a mirror.
A beam of light consisting of red, green and blue colours is incident on a right-angled prism as shown. The refractive index of the material of the prism for the above red, green and blue wave lengths are 1.39, 1.44 and 1.47 respectively.The prism will
Difference in refractive indices of blue and green colour are less so they are seen together and red is seen separate because deviation depends on refractive index
An object is placed at a distance 2f from the pole of a convex mirror of focal length f. The linear magnification is
A plane mirror reflects a beam of light to form a real image.The incident beam is
Virtual object forms real image on a plane mirror, so rays convergent.
Which of the following is false ?
Convex lens can form image with m <1, m > 1 and m = 1 depending upon the position of the object.Convex lens forms magnified image (m > 1) when the object is pole and 2f, same size as the object (m =1)when the object is at 2f and smaller image (m < 1), when the object is beyond 2f.
We wish to see inside an atom. Assume the atom to have a diameter of 100 pm. This means that one must be able to resolve a width of say 10 pm. If an electron microscope is used the energy required should be
The focal lengths of objective and eye lens of an astronomical telelscope are respectively 2 meter and 5 cm.Final image is formed at (i)least distance of distinct vision(ii) infinity Magnifying power in two cases will be
The focal length of the objective of a telescope is 60 cm. To obtain a magnification of 20, the focal length of the eyepiece should be