refraction telescope

Telescopes - Telescope is an optical instrument which is used for viewing heavenly bodies and distant objects. There are basically two types of telescopes: refracting telescope reflecting telescope Refraction Telescope Reflection..

Refraction Telescope The objective lens is replaced by a concave parabolic mirror of large aperture. The images in such telescopes are brighter and have a high resolving power compared to astronomical telescope...

The previous chapter dealt with the refraction of light by lenses and also about the formation of various types of images by a lens for different positions of the object. In this chapter let us find out how lenses are used in optical instruments like microscopes and telescopesh..

The previous chapter dealt with the refraction of light by lenses and also about the formation of various types of images by a lens for different positions of the object. In this chapter let us find out how lenses are used in optical instruments like microscopes and telescopesh..

Introduction - The previous chapter dealt with the refraction of light by lenses and also about the formation of various types of images by a lens for different positions of the object. In this chapter let us find out how lenses are used in optical instruments like microscopes and te..

= half angle of the cone of light from the point object kept under objective lens. m = refractive index of the medium between the object and objective lens. Resolving power of a telescope is the reciprocal of the small angular separation d q between two distant objects whos..

> In a concave mirror, magnification can be both positive or negative, depending on the type of image formed (virtual or real). Other formulae for magnification are Spherical mirrors have several applications. A convex mirror is used as reflector in street lamps. It is also used as a rear view mirr..

Where u and v are distances of object and image from optical centre of objective lens, f e is focal length of eye lens. An astronomical telescope is used for observing heavenly bodies like stars and planets etc. The objective lens forms a real, inverted and smaller image of distant object..

When the object is at infinity, the rays coming from it are parallel to each other. The image is - formed at F 2 inverted real highly diminished The table gives at a glance the position, size and nature of the image formed by a convex lens corresponding to the different positions of th..