An optical instrument uses eye-lens of power 16 D and objective lens of power 50D and has a tube length of 16.25 cm. Name the optical instrument and calculate its magnifying power if forms the final image at infinity.

An optical instrument uses a lens of power 100 D for objective lens and 50 D for its eyepiece. When the tube length is kept at 25 cm, the final is formed at infinity. Calculate the magnification produced by the instrument.

An optical instrument uses a lens of power 100 D for objective lens and 50 D for its eyepiece. When the tube length is kept at 25 cm, the final is formed at infinity. Identity the optical instrument.

An optical instrument uses a 25 D objective and 20 D eyepeice with a tube length of 25 cm when eye is least strained

An optical instrument uses a 25 D objective and 20 D eyepeice with a tube length of 25 cm when eye is least strained

For a compound microscope, the focal length of eyepiece and objective lens is 5 cm and 1 cm, respectively. The length of the tube is 30 cm. If the final image is formed at infinity, calculate the magnifying power of the microscope.

A compound microscope uses an objective lens of focal length 4 cm and eye lens of focal length 10 cm . An object is placed at 6 cm from the objective lens. Calculate magnifying power of compound microscope if final image is formed at the near point. Also, calculate length of the tube of compound microscope.