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An equiconvex lens of focal length 'f' is cut into two identical plane convex lenses. How will the power of each part be related to the focal length of the original lens ?
Concept: Refraction at a Spherical Surface and Lenses >> Refraction by a Lens
A double convex lens of + 5 D is made of glass of refractive index 1.55 with both faces of equal radii of curvature. Find the value of its radius of curvature.
Concept: Refraction at a Spherical Surface and Lenses >> Refraction by a Lens
Draw a ray diagram showing the image formation of a distant object by a refracting telescope ?
Concept: Optical Instruments >> Telescope
Write the two important factors considered to increase the magnifying power?
Concept: Optical Instruments >> Telescope
Describe briefly the two main limitations and explain how far these can be minimized in a reflecting telescope ?
Concept: Optical Instruments >> Telescope
Draw a ray diagram showing image formation in a compound microscope ?
Concept: Optical Instruments >> Simple Microscope or a Reading Glass
Define the term 'limit of resolution'?
Concept: Ray Optics - Mirror Formula
How is 'limit of resolution' related to resolving power of a microscope ?
Concept: Optical Instruments >> Simple Microscope or a Reading Glass
Suggest two ways by which the resolving power of a microscope can be increased?
Concept: Optical Instruments >> Simple Microscope or a Reading Glass
"A telescope resolves whereas a microscope magnifies." Justify this statement ?
Concept: Optical Instruments >> Telescope
Define its magnifying power and write the expression for it?
Concept: Optical Instruments >> Telescope
A compound microscope uses an objective lens of focal length 4 cm and eyepiece lens of focal length 10 cm. An object is placed at 6 cm from the objective lens. Calculate the magnifying power of the compound microscope. Also calculate the length of the microscope.
Concept: Optical Instruments >> Simple Microscope or a Reading Glass
A giant refracting telescope at an observatory has an objective lens of focal length 15 m. If an eyepiece lens of focal length 1.0 cm is used, find the angular magnification of the telescope. If this telescope is used to view the moon, what is the diameter of the image of the moon formed by the objective lens? The diameter of the moon is 3.42 × 106 m and the radius of the lunar orbit is 3.8 × 108 m.
Concept: Optical Instruments >> Telescope
Use the mirror equation to show a convex mirror always produces a virtual image independent of the location of the object ?
Concept: Ray Optics - Mirror Formula
Calculate the speed of light in a medium whose critical angle is 30° ?
Concept: Total Internal Reflection
Find the radius of curvature of the convex surface of a plano-convex lens, whose focal length is 0.3 m and the refractive index of the material of the lens is 1.5.
Concept: Power of a Lens
Out of blue and red light which is deviated more by a prism? Give reason.
Concept: Dispersion by a Prism
Give the formula that can be used to determine refractive index of materials of a prism in minimum deviation condition ?
Concept: Dispersion by a Prism
Draw a ray diagram to show the working of a compound microscope. Deduce an expression for the total magnification when the final image is formed at the near point.
In a compound microscope, an object is placed at a distance of 1.5 cm from the objective of focal length 1.25 cm. If the eye piece has a focal length of 5 cm and the final image is formed at the near point, estimate the magnifying power of the microscope.
Concept: Optical Instruments >> Simple Microscope or a Reading Glass
What type of wavefront will emerge from a (i) point source, and (ii) distance light source?
Concept: Refraction at a Spherical Surface and Lenses >> Refraction at Spherical Surfaces
