Question Answers

In the case of hypermetropia (i) the image of a near object is formed behind the retina (ii) the image of a distant object is formed in front of the retina (iii) a concave lens should be used for correction (iv) a concave lens should be used for correction its magnifying power When the length [...]

The angular resolution of a 10 cm diameter telescope of wavelength of 5000 A^∘ is of the order of : The angular resolution of a 10 cm diameter telescope of wavelength of 5000 A^∘ is of the order of : November 15, 2020 Category: Cengage NEET by C.P Singh , Chapter 19 - Optical Instruments [...]

The resolving power of an astronomical telescope is 0.2 seconds. If the central half portion of the objective lens is covered, the resolving power will be The resolving power of an astronomical telescope is 0.2 seconds. If the central half portion of the objective lens is covered the resolving power will be November 15, 2020 [...]

Two points separated by a distance of 0.1mm can just be resolved in a microscope when a light of wavelength 6000Å is used. If the light of wavelength 4800Å is used this limit of resolution becomes Two points separated by a distance of 0.1mm can just be resolved in a microscope when a light of [...]

For a telescope to have large resolving power the 1. focal length of its objective should be large 2. focal length of its eye-piece should be large 3. focal length of its eye-piece should be small 4. aperture of its objective should be large its magnifying power When the length of a microscope tube increases [...]

In the pervious question, if the tube length is increased slightly from its position of normal adjustment, if the tube length is increased slightly from its position of normal adjustment In the pervious question November 15, 2020 Category: Cengage NEET by C.P Singh , Chapter 19 - Optical Instruments , Part 2 ,

An astronomical telescope in normal adjustment receives light from a distant source S. The tube length is now decreased slightly An astronomical telescope in normal adjustment receives light from a distant source S. The tube length is now decreased slightly November 15, 2020 Category: Cengage NEET by C.P Singh , Chapter 19 - Optical Instruments [...]

In an astronomical telescope in normal adjustment a straight black line of length L is drawn on inside part of objective lens. The eye-piece forms a real image of this line. The length of this image is I . The magnification of the telescope is its magnifying power When the length of a microscope tube [...]

The diameter of the moon is 3.5×10^3 km and its distance from the earth is 3.8×10^5 km. It is seen by a telescope having the focal length of the objective and the eye-piece as 4m and 10cm respectively. The diameter of the image of the moon will be approximately its magnifying power When the length [...]

A simple telescope, consisting of an objective of focal length 60 cm and a single eye lens of focal length 5 cm is focused on a distant object in such a way that parallel rays emerge from the eye lens. If the object subtends an angle of 2^o at the objective, the angular width of [...]