Ray Optics and Optical Instruments

Related Questions

• A person is suffering from myopic defect. He is able to see clear objects placed at 15 cm. What type and of what focal length of lens he should use to see clearly the object placed 60 cm away

  ---

• If in compound microscope $m_1$ and $m_2$ be the linear magnification of the objective lens and eye lens respectively, then magnifying power of the compound microscope will be

  ---

• A combination of two thin lenses with focal lengths ${{f}_{1}}$ and ${{f}_{2}}$ respectively forms an image of distant object at distance $60 cm$ when lenses are in contact. The position of this image shifts by $30 cm$ towards the combination when two lenses are separated by $10 cm$. The corresponding values of ${{f}_{1}}$ and ${{f}_{2}}$ are

  ---

• At what distance from a convex lens of focal length 30 cm, an object should be placed so that the size of the image be 1/2 of the object

  ---

• In a thin prism of glass (refractive index 1.5), which of the following relations between the angle of minimum deviations ${{\delta }_{m}}$ and angle of refraction $r$ will be correct

  ---