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choroidinside the sclera it is thin non transparent or opaque its front part of iris there is an aperture known as the pupil which control amount of
sclerait is an outer most thick impermeable to light it is more convex and its front part is transparent is known as
human eyeit is spherical in shape diameter about 25 cm having of three layersa sclera
magnifying glassa biconvex lens of short focal length and low power which forms a virtual and magnified image of an object placed with its focal
presbyopiathe accommodation power of a person is lost by which the suffers a long sightedness it is known as presbyopia or lack of
astigmatismin this defect the surface of eye is not perfectly spherical the eye has different focal point in dissimilar planes and image of an object
correction of short sightednessto remove this defect a convex lens is used in front of
defect of short sightednessin this defect the image of the object is formed in front of retina or the lens become so
short sightened or myopiawhen a person cant able to see objects clearly but can see near objects clearly this defect of vision is known as short
defectthe image is formed behind the retina and lens becomes
defects of visionlong sightenedwhen a person can see far objects clearly but cannot see near object clearly then this defect of vision is called as
convex lens convex lens converges rays parallel to its principal axisit is thick in the middle and thin at the
lensa transport refractive body bonded by one or two spherical surface known as lens there are various kinds of lensesegdouble convex lensdouble
total internal reflection when a ray of light passes from denser medium to rare medium and angle of incidence is greater than the critical angle the
angle of minimum deviationthe angle of deviation has least value when incident ray and emergent ray make equivalent angle with the normal the value
angle of deviationwhen a ray of light passes by a prism it changes its path inside the prism and forms an angle with the emergent ray this angle is
prisma transparent refractive device having of three rectangular and two refractive surfaces is known as prismn sin a dm
refractive indexthe ratio of sine of angle of incidence to the sine of angle of refraction is constant for all rays passing single medium to another
snells lawthe ratio of sine of angle of incidence to the sine of angle of refraction is constant for all rays passing from one medium to another
laws of refractionthere are two laws of refractionthe incident ray the refracted ray and the normal to the surface of the point of incidence all lie
refraction of lightwhen a ray of light in single medium meets the surface of second medium a part of the ray enters in the second medium this
uses of ultrasonics1 ultrasonic are used in diagnosis of disease physical therapy as surgical tool amp industry2 they are used in sounding devices to
echothe sound heard after reflection from an obstacle is known as
beatsthe periodic vibrations in intensity or loudness of sound because of superposition of two sound waves of similar amplitude and slightly
the loudness of sound depends on amplitude of vibration area of vibrating body distance from the sounding body density of the