One day Chetan’s mother developed a severe stomach ache all of a sudden. She was rushed to the doctor who suggested for an immediate endoscopy test and gave an estimate of expenditure for the same. Chetan immediately contacted his class teacher and shared the information with her. The class teacher arranged for the money and rushed to the hospital. On realising that Chetan belonged to a below average income group family, even the doctor offered concession for the test fee. The test was conducted successfully.
Answer the following questions based on the above information:
  1. Which principle in optics is made use of in endoscopy?
  2. Briefly explain the values reflected in the action taken by the teacher.
  3. In what way do you appreciate the response of the doctor on the given situation?
CBSE OUTSIDE DELHI - SET 1 2013
Download our app for free and get startedPlay store
  1. Total internal reflection: If a light ray enters at one end of an optic fibre coated with a material of low refractive index, it refracted and strikes the walls at angle greater than critical angle. Thus light rays shows multiple reflections, without being absorbed at the side walls.
  1. The teacher knows that Chetan belongs to a below average income group family, so he/she immediatelly arranged the money required to be paid as test fee. His/her caring and helping attitude towards the others resulted in timely help to Chetan’s mother. Such helping attitude on the part of the person living in the society make it a better society to live in.
  2. Seeing the situation of Chetan’s family and helping attitude of class teacher, doctor took the sympathetic view of the situation, and give the reduction in fee, which is highly appreciable. Such professional ethics of doctor in the society would be an immense help to the person’s belonging to below average income groups.
art

Download our app
and get started for free

Experience the future of education. Simply download our apps or reach out to us for more information. Let's shape the future of learning together!No signup needed.*

Similar Questions

  • 1
    An angular magnification (magnifying power) of 30X is desired using an objective of focal length 1.25 cm and an eyepiece of focal length 5 cm. How will you set up the compound microscope?
    View Solution
  • 2
    1. Draw a labelled ray diagram to obtain the real image formed by an astronomical telescope in normal adjustment position. Defineits magnifying power.
    2. You are given three lenses of power 0.5 D, 4 D and 10 D to design a telescope.
    1. Which lenses should he used as objective and eyepiece? Justify your answer.
    2. Why is the aperture of the objective preferred to be large?
    View Solution
  • 3
    A short object of length L is placed along the principal axis of a concave mirror away from focus. The object distance is u. If the mirror has a focal length f, what will be the length of the image? You may take $L < < |v - f|.$
    View Solution
  • 4
    Three immiscible liquids of densities $d_1 > d_2 > d_3$ and refractive indices $\mu _1 > \mu _2 > \mu _3$ are put in a beaker. The height of each liquid column is $\frac{\text{h}}{3}$. A dot is made at the bottom of the beaker. For near normal vision, find the apparent depth of the dot.
    View Solution
  • 5
    An optical instrument used for angular magnification has a 25D objective and a 20D eyepiece. The tube length is 25cm when the eye is least strained.
    1. Whether it is a microscope or a telescope?
    2. What is the angular magnification produced?
    View Solution
  • 6
    A circular disc of radius 'R' is placed co-axially and horizontally inside an opaque hemispherical bowl of radius 'a' (Fig). The far edge of the disc is just visible when viewed from the edge of the bowl. The bowl is filled with transparent liquid of refractive index μ and the near edge of the disc becomes just visible. How far below the top of the bowl is the disc placed?
    View Solution
  • 7
    A particle is moving at a constant speed V from a large distance towards a concave mirror of radius R along its principal axis. Find the speed of the image formed by the mirror as a function of the distance x of the particle from the mirror.
    View Solution
  • 8
    A lady uses +1.5D glasses to have normal vision from 25cm onwards. She uses a 20D lens as a simple microscope to see an object. Find the maximum magnifying power if she uses then microscope
    1. Together with her glass
    2. Without the glass. Do the answers suggest that an object can be more clearly seen through a microscope without using the correcting glasses?
    View Solution
  • 9
    A point object 'O' is kept in a medium of refractive index $n_1$ in front of a convex spherical surface of radius of curvature R which separates the second medium of refractive index $n_2$ from the first one, as shown in the figure. Draw the ray diagram showing the image formation and deduce the relationship between the object distance and the image distance in terms of $n_1, n_2$ and R.
    1.  
    1. hen the image formed above acts as a virtual object for concave spherical, surface separating the medium $n_2$ from $n_1 (n_2> n_1),$ draw this ray diagram and write the similar (similar to (a) relation. Hence obtain the expression for the lens maker's formula.
    View Solution
  • 10
    How is the working of a telescope different from that of a microscope?
    The focal lengths of the objective and eyepiece of a microscope are 1.25 cm and 5 cm respectively. Find the position of the object relative to the objective in order to obtain an angular magnification of 30 in normal adjustment.
    View Solution