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Humber Polytechnic · BMED 1503

Humber Polytechnic BMED 1503 tutoring

Help with mechanics, geometric optics and biomedical physics applications.

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Course overview

BMED 1503 covers mechanics and geometric optics with biomedical applications in Humber’s published description. Its place in the current biomedical degree curriculum has not been confirmed. This guide connects calculations to physical models, using force diagrams to identify interactions and ray diagrams to understand how an optical system forms an image.

The topics here come from the 2025–26 course description. We have not confirmed their alignment with the 2026–27 outline. Your current outline, if you have it, helps us identify the topics you’re studying.

BMED 1503 topics to review

Kinematics and forcesEnergy and momentum conservationTorque and equilibriumGeometric optics, optical instruments and biomedical applications

Common difficulties

  • Confusing image size with image distance
  • Invoking a conservation law without checking the system

Useful foundations to review

Review rearranging equations, consistent units, vectors and similar triangles. Write down the system and assumptions before selecting a physical law. In optics, label object distance, image distance and focal length separately; a sign convention is part of the model, not a correction after calculation.

Registration requirements

The guidance above is study preparation, not an eligibility decision. Confirm current prerequisites, restrictions and availability with Humber Polytechnic.

Check the official course catalogue

Interpret an image formed by an ideal thin lens

An object 2 cm tall is 30 cm in front of a converging thin lens with focal length 10 cm. Find the image distance and height. Use positive object distance for a real object and positive image distance for a real image.

Show the reasoning

  1. Apply the thin-lens relation

    Let ff be focal length, dod_o object distance and did_i image distance. Use 1/f=1/do+1/di1/f=1/d_o+1/d_i. With all distances in centimetres, 1/di=1/10−1/30=1/151/d_i=1/10-1/30=1/15. Therefore di=15 cmd_i=15\text{ cm}, on the opposite side of the lens from the object.

  2. Calculate signed magnification

    Let hoh_o and hih_i be the signed object and image heights. The magnification is m=−di/do=−15/30=−0.5m=-d_i/d_o=-15/30=-0.5. Hence hi=mho=−1 cmh_i=mh_o=-1\text{ cm}. The image is inverted and half the object’s height; the negative height describes orientation.

  3. Check the geometry

    The object is beyond twice the focal length. A ray sketch should place the real, reduced image between one and two focal lengths: here 15 cm lies between 10 and 20 cm. This checks the algebra using the same ideal thin-lens assumptions.

Try an independent variation

A different converging lens has f=12 cmf=12\text{ cm}. A 3 cm object is 8 cm in front of it. Find and interpret the image.

Check your reasoning

1/di=1/12−1/8=−1/241/d_i=1/12-1/8=-1/24, so di=−24 cmd_i=-24\text{ cm}. Then m=3m=3 and hi=9 cmh_i=9\text{ cm}. The image is virtual, upright and enlarged, on the object’s side.

To connect the signs in this calculation to a ray sketch, review how real and virtual images form. Practise ray diagrams and lens images

How tutoring can help

You can start with the problem statement, a question or any work you’ve already tried. A tutor can help draw a force or ray diagram, choose a physical principle and explain the signs before working through the calculation with you. A similar example can help you practise interpreting the result and explaining the model.

Exam preparation for BMED 1503

Practise selecting a model before substituting numbers. For mechanics, identify the body, interval and external interactions. For optics, predict whether the image should be real or virtual and upright or inverted, then compare that prediction with the calculated signs.

Use your section’s outline to choose the chapters to review. We work through permitted practice and comparable problems, without completing graded assignments or exams on your behalf.

Independent practice

Free practice and study guides for BMED 1503

90 min

Work, Energy or Momentum: Choose the Method

Choose a system and interval to connect work, energy and momentum. Guided collision and force–position practice, with an optional centre-of-mass and relative-displacement extension.

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BMED 1503 · official course reference