Question 4: Fill in the blanks with suitable words. This happens because the surface is plane without any defects. Studying straight from school ordered textbooks can be cumbersome for many students. What is function of iris? What is a nictating membrane? Join them together to form a prism. Explain how you can take care of your eyes. The lesson plans are created as per your requirements.
Therefore, despersion of light into a spectrum takes place. Answer: Plane mirrors are used for dressing up, shaving beards, in scientific metres and for designing periscope. The other option is to learn through our live learning android app. The light sensitive cells having shape of cones a respond mainly to colours of incident light b respond mainly to amount of incident light c respond to both colour and amount of light d enables us to see in dark Answer: a. Which of the following material cannot be used to make a lens? Test yourself after studying each chunk. They help the visually challenged persons in taking notes, reading and writing and in learning mathematics.
Colour blindness is due to the absence of cones on the nerve endings on the retina. Draw the reflected ray from the second mirror. Can you see objects outside the room? Students can watch up best answers to their textbook and easy understand concepts much better and well prepared for their exams. Sounds that are melodious and pleasing to ear are known as music. Give one example of natural dispersion. The basics to have been explored in a detailed fashion for a better comprehension of the subject along with diagrams, tables and charts. These characters make up the letters of the alphabet, punctuation marks, numbers and everything else that can be printed does not have a separate alphabet of capital letters as there is in a print.
A sound is said to be high pitched if its frequency of vibration is high, and is low pitched for a small frequency of vibration. They help us to distinguish between colours. Night birds can see clearly at night but not cjuring the day. This will give you confidence and ensure that the topics are fresh in your mind. Answer: Some people cannot distinguish between the different colours. Since sound is produced when an object vibrates, the dholak produces a sound.
What are cones and rods? The solution notes are written keeping in mind the average student's learning ability. Answer: The perpendicular drawn at the point of incidence is known as normal. Answer: There will be more noise in the house which is along the roadside. Draw a diagram to show dispersion of light. What are the causes of blindness? If lower half of a convex lens is painted black then a no image is formed b only erect image is formed c only diminished image is formed d image is formed but is of reduced intensity. We hope these books help you carve a path out for yourself in the daily study schedule and approach learning in a fun manner. What is the angle of incidence of a ray if the reflected ray is at an angle of 90° to the incident ray? If the refractive index is more then optical density is a more b less c equal d independent of refractive index Answer: a Question 8.
This helps the students to get a stronger grasp of the chapters and topics. The cones are sensitive to bright light and can sense colours. Parents too can breathe easy knowing that their kids are getting a valuable education using an online portal. Angle of incidence is equal to the angle of reflection. Since vacuum is devoid of any medium, sound cannot travel through it.
Can he see himself in the mirror? Why should children take milk and eat carrots? They have worked together to provide solutions that dig deeper than just providing the right answer. With time, students develop an interest in the subjects they learn and this is what we at Vedantu wish to achieve. Differentiate between regular and diffused reflection. For example, the sound produced by violins, pianos, flutes, pungs, etc. The students generally get confused in the types of soils, vegetation, and forests. Answer: a Dholak is a musical instrument.
When a string is plucked, it sets into vibration. We have created most accurate Class 8 Social Science Geography, Civics, and History for your reference. Time period is the time required to complete one oscillation. State the laws of reflection. Also can he see the image of objects situated at P, Q and R? Answer: Non-optical aids include visual aids, tactual aids, auditory aids and electronic aids Question 19. A sketch of a human larynx is shown in the following figure. Answer: Sunlight is a mixture of seven colours also known as white light.
The image seen by a insect is a blured picture. The blind spot of the eye is a at the junction of optic nerve and retina b on one side of optic nerve c on one side of retina d in the centre of retina Answer: a Question 18. Boojho stands at A just on the side of a plane mirror as shown in figure. Answer: In irregular reflection the reflected rays are not parallel. How is Braille system used? We want our students to understand the basic and advanced concepts of class 8 science - that is why our lectures are live and not pre-recorded.