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प्रश्न
What is a lacrimal gland?
उत्तर
Lacrimal gland is a tear gland located at the upper sideward portion of the eye orbit. Its secreation lubricates the surface of the eye, washes always the dust particles and kills germs
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संबंधित प्रश्न
Fill in the following blank with suitable word:
The part of eye which alters the size of the pupil is............
Why does it take some time to see objects in a dim room when you enter the room from bright sunshine outside?
There are two types of light-sensitive cells in the human eye:
What is each type called?
Which of the following changes occur when you walk out of bright sunshine into a poorly lit room?
(a) the pupil becomes larger
(b) the lens becomes thicker
(c) the ciliary muscle relaxes
(d) the pupil becomes smaller
Which parts of the eye cause rays of light to converge on the retina?
An object is moved closer to an eye. What changes must take place in the eye in order to keep the image in sharp focus?
Name the following:
The part of the eye responsible for its shape.
Mention if the following statement is true (T) or false (F) Give reason.
yellow spot of the retina is the region of colour vision
With reference to the functioning of the eye, answer the question that follow:
What is the shape of the lens during distant vision?
Draw a labeled diagram of the front view of human eye.
Name the following:
The focal length of the lens is altered by the contraction of which type of muscles.
Name the following:
The area where the image is formed but not seen by our eye is termed as.
Choose the Odd One Out:
The image of the object in the human eye is formed on the cross screen.
Write scientific reason.
The movie cannot be enjoyed if seat of a viewer is too close to the screen in the cinema.
Shylesh is a school-going kid studying standard VIII. He is crazy about playing video games on mobile phones. After a couple of months, his eyes turned red and he felt severe pain in his eyes. His science teacher enquired about this and advised his parents to take him to an eye doctor.
- How does excessive usage of mobile phone affect our eyes?
- What are the values shown by the teacher?
Boojho while waving his hand very fast in front of his eyes, observes that his fingers appear blurred. What could be the reason for it?
What kind of lens is there in our eyes? Where does it form the image of an object?
An aperture that controls the passage of light into the eye is ______.
