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Optics
The focal length of a diverging lens is negative. If f = −13 cm for a particular diverging lens, where will the image be formed of an object located 42 cm to the left of the lens on the optical axis?
cm to the left of the lens
What is the magnification of the image?
cm to the left of the lens
What is the magnification of the image?
Optics
A shock absorber acts like an elastic spring of constant k. It compresses by 2.5 cm when a mass m is placed on it. When the absorber-mass system is pressed and left, it begins to oscillate. Calculate the frequency of oscillations. Take g : 10 ms^-2
Optics
An object and screen are 80cm apart. There are two positions at which a convex lens forms real image on the screen the magnification in two cases are 3/2 and 2/3 . calculate the focal length of the lens
Optics
Calculate the magnitude of the faintest object that can be detected by an optical
telescope of diameter 5.0 m.
telescope of diameter 5.0 m.
Optics
Calculate the magnitude of the faintest object that can be detected by an optical
telescope of diameter 5.0 m.
telescope of diameter 5.0 m.
Optics
a point source of light S is placed between concave mirror. The beam of light incident on plane mirror become parallel to optical axis after reflection through the concave mirror. The focal length of concave mirror is 30 cm and the point source is midway between concave mirror and plane mirror. Find the separation between concave mirror and plane mirror
Optics
An object is placed 2.4m from a convex lens. It forms an image 12cm from the lens on a screen. A glass slab of thickness 1cm and refractive index 1.5 is introduced between the lens and screen. By what distance should the object be moved so that the image is in focus?
Optics
Red light with a wavelength of 725 nm shines through a single slit, and forms a pattern on a screen placed 1.25 m away. If the width of the slit is 18.5 micrometers, find the width of the central maximum (a) in degrees and (b) in centimeters.
Optics
Phosphorescence refers to
1)optical absorption
2)fluoresence
3) delay fluoresence
4) emission of light
1)optical absorption
2)fluoresence
3) delay fluoresence
4) emission of light
Optics
Unpolarized light passes through two polaroids, the axis of one is vertical and that of the other is 60 degrees to the vertical. (a) what is the orientation and intensity of the transmitted light. (b) which happens if a third polaroid, with axis 45 degrees to each of the other two, is placed in between
