An object of size 7.0 cm is placed at 27 cm in front of a concave mirror of focal length 18 cm. Converging lens means a convex lens. Further images of an image are also formed. Copyright © 2020: |. Lateral inversion: If we stand before a plane mirror and move our right hand, our image appears to move its left hand. NCERT 8th Class (CBSE) Science: Light: Short / Long Answers, Multiple choice questions for NCERT 8th Class (CBSE) Science: Light - Principle of forming multiple images by mirrors at an angle to each other is used in a toy called kaleidoscope. Choose the correct option: Image formed by the convex mirror is _____. (ix) The AB is position of object. (iii) Mark two foci F and F' on two sides of the lens, each at a distance of 2 cm from the lens. Magnification, m = h'h = -vu ∴ Image size,                         h' = -vhu                              =-(-54)×(+7)(-27)= -14 cm The image is real, inverted and enlarged in size. But there is one difference is in your left and right. Log in. So, n = (360/10) — 1 = 36 — 1 = 35. Answer: When two mirrors are placed at angles to each other we get multiple images because the image formed by one mirror acts as an object for the second mirror. © 3. As the distances given in the question are large, so we choose a scale of 1: 5, i.e., 1 cm represents 5 cm. 1Light 2. (vi) Draw a line A'B', perpendicular to principal axis from B'. Leave a comment Image size, h' = ? 2. This sending back of light by objects is called reflection of light. plane. Here, Object size, h = + 7.0 cmObject distance, u = - 27 cmFocal length, f = - 18 cm Image distance, v = ? At what distance from the mirror should a screen be placed so that a sharp focussed image can be obtained? Then, we are able to see an object because of light being reflected from the object. Here, 0 = 10°. Light: (i) Light is a form of energy, which includes the sensation of vision in our eyes and make us able to see various things present in our surrounding. Ltd. Download books and chapters from book store. (adsbygoogle = window.adsbygoogle || []).push({}); © Copyright 2020, All Rights Reserved A concave lens of focal length 15 cm forms an image 10 cm from the lens. Measure distance BC. Infact, our entire image is reversed sideways. Answer: From a submarine under the sea, a sailor can see objects and enemy ships on the surface of the sea by using periscope. Your email address will not be published. In case of a plane mirror the image formed is erect and same size as the object. Now, we draw the ray diagram as follows:(i) Draw a horizontal line to represent the principal axis of the convex lens. This continues till no more reflection by either mirror is possible. March 26, 2018 Science In Everyday Life Solutions for Class 8 Science Chapter 15 Light are provided here with simple step-by-step explanations. NCERT Solution for Class 8 Science Chapter, NCERT Solutions for Class 8 Science Solutions, 11th CBSE NCERT Chemistry Mid Term Exam Set B (2019-20), Wastewater Story: 7th Class NCERT CBSE Science Ch 18, Forests: Our Lifeline – 7th NCERT CBSE Science Ch 17, Water: A Precious Resource – 7 Class CBSE Science Ch 16, Light: 7th Class NCERT CBSE Science Chapter 15. Focal length, f = - 15 cm    [f is - ve for a concave lens], Image distance, v = - 10 cm [Concave lens forms virtual image on same side as the object, so v is - ve]. Draw the ray diagram and find the position, size and the nature of the image formed. Answer: The phenomenon of reversal of right and left sides in the mirror image formed by a plane mirror, is called lateral inversion. These solutions for Light are extremely popular among Class 8 students for Science Light Solutions come handy for quickly completing your homework and preparing for exams. Answer: The second law of reflection states that the incident ray, the normal and the reflected ray all lie in the same Therefore, on this scale 5 cm high object, object distance of 25 cm and focal length of 10 cm can be represented by 1 cm high, 5 cm and 2 cm lines respectively. Answer: The number of images formed by mirrors at an angle is n = (360/0) — 1 where 0 = angle between the mirrors. (viii) Draw AB', perpendicular to the principal axis from A'. Hence, the number of images will be 35. We draw the ray diagram as follows:(i) Draw the principal axis (a horizontal line). (ii) Centre line is shown by DE. (ix) Now AB', represents the real, but inverted image of the object AB. (x) Then, measure CB' and A'B'. Ans. Two mirrors placed at right angles (90°) to each other will form actually 3 images. should be placed at a distance of 54 cm on the object side of the mirror to obtain a sharp image. Download the PDF Question Papers Free for off line practice and view the Solutions online. Class 8 > Science > Light Worksheets Sample CBSE Class 8 Science Light Worksheet Questions. Find the size and the nature of the image. Focal length, f = - 15 cm    [f is - ve for a concave lens]Image distance, v = - 10 cm [Concave lens forms virtual image on same side as the object, so v is - ve]As,                                                          Object distance, u = -30 cm. Answer: The objects send back the light which falls on them. Tags CBSE Class 8 NCERT Solutions CBSE Class 8 Science Solutions Free Class 8 Science Solutions Free NCERT Online Solutions NCERT Books Online Solutions NCERT CBSE Class 8 Science Solutions NCERT CBSE Solutions NCERT Class 8 Science Chapter NCERT Class 8 Science Solutions NCERT Solution for Class 8 Science Chapter NCERT Solutions NCERT Solutions for Class 8 Science Solutions, Light 7th Class NCERT CBSE Science Chapter 15 Question: Briefly mention whether mirror change the direction of …, Your email address will not be published. (vi) Draw a line from A to C (centre of the lens), which goes straight without deviation. 1. real and upright 2. virtual and upright 3. real and inverted 4. virtual and inverted. The image is real, inverted and enlarged in size. (v) Draw a line AD, parallel to principal axis. This video is highly rated by Class 7 students and has been viewed 786 times. Here, we have Object size, h = + 5 cm Object distance, u = -20 cmRadius of curvature, R = + 3.0 cm [R is +ve for a convex mirror]∴ Focal length ,  f = R2 = +15 cm From mirror formula,                      1v = 1f-1u we have,                       1v= 1+15-1-20      = 4+360     = 760 Image distance, v = 607≃ 8.6 cm.

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